Plant catalogued as "lloydii" have (usually) characteristic long white to dark red papery spines with multiple, very tight, thin and wavy ribs.
Flowers are White and Purple and are almost concealed among the spines.

They are commonly called wave or brain cacti because of their crinkly appearance. 
 

Description: Stems: Solitary, globose, vivid green with a flat tops  8-15cm wide and up to 7-20 cm tall, typically with 50 to 100 multiple, very tight, thin, wavy ribs
Areoles & spines: Areoles are covered with white felt in young plants, each has 6 to 9 radial spines, the upper ones are longer whit a central stout and flat erected spine up to 7cm long, while the lower ones are shorter and point downwards. The spines are different lengths.
Flowers: The blooms are white with a violet to purple midvien in early spring.  

Cultivation:  Small growing and easy to to care and flower. Because of it’s small size makes a great potted plant specimen, great for beginning collectors. It needs regular cacti soil with good drainage. Propagation: Seeds (usually) or by the shoots of adult plants (if available). Exposure: need some direct sun but is tolerant and prefers light shade during the hot Summer months, allow to dry between watering. Watering should be curtailed during the winter months. Frost Tolerance (-6 to -4°C) depending on the form .

Photo of conspecific taxa, varieties, forms and cultivars of plants belonging to the Echinofossulocatus multicostatus complex (This Taxon has lots of synonyms (like most Echinofossulocactu) whit several controversial varieties and subspecies):

• E. multicastatus
• E. multicostatus forma cristata
• E. erectocentrus (multicostatus)
• E. lloydii (multicostatus)

Scientific name: Stenocactus lloydii (Britton & Rose) A. Berger 1929

(Echinofossulocactus multicostatus  (Hildmann ex K. Schumann) Britton et Rose 1922)

Tribe:  Cacteae -- Subtribe: Echinocactinae

Origin: Mexico (Coahuila, Chihuahua, Durango).

Synonyms:

• Echinofossulocactus multicostatus (Hildmann ex K. Schumann) Britton et Rose 1922
  = Stenocactus multicostatus (Hildmann ex K. Schumann) A. Berger 1929, (Mexico)
  = Echinocactus multicostatus Hildmann ex K. Schumann 1898
• Echinofossulocactus lloydii Britton et Rose 1922
  = Stenocactus lloydii (Britton et Rose) A. Berger 1929
• Echinofossulocactus zacatecasensis Britton et Rose 1922
  = Stenocactus zacatecasensis (Britton et Rose) A. Berger 1929
• Echinofossulocactus erectocentrus Backeberg 1961 n.v.p Meyrán 1977
   

A old  specimen with beautiful long red spines