SYSTEMATIC DESCRIPTIONS SPATANGINA. 57 



The peristome is excentric anteriorly, stelliform, and is furnished with 

 a very apparent floscelle. The periproct is narrow, elongate, supramarginal, 

 opening on the posterior face at the summit of a groove, slightly indicated 

 and surmounted by a slight expansion of the test. 



Height, 25.5 mm., length, 48 mm., width, 34 mm. These measure- 

 ments do not correspond very closely with those given by Cotteau, but 

 the specimen is somewhat distorted and he may have allowed for this. 

 The sutures of the plates in the type are nearly or quite invisible, as 

 are also the genital pores. I saw no trace of the ambulacra below the 

 petals or at all on the ventral side of the test, but the tubercular 

 ornamentation of the test is clearly preserved. 



Eocene, St. Bartholomew limestone, St. Bartholomew, cotype, the 

 original of Cotteau's figures, Guppy collection ex Cleve, 1 specimen, 

 U. S. Nat. Mus. No. 115417. Two additional specimens, apparently 

 cotypes, both good for the ventral side showing the peristome, St. 

 Bartholomew, Guppy collection ex Cleve, U. S. Nat. Mus. No. 115420. 

 Cotteau cites specimens from the Eocene of Santa Lucia, Cuba. 



Parapygus parallelus (Cotteau). 



Echinanthus parallelus Cotteau, 1897, Bol. Com. Mapa Geol. Espafia, vol. 22, p. S3, 

 plate 12, figs. 8 to 13. 



This species is referred by Cotteau to Azpeita, but with him it is 

 simply a manuscript name with no standing. I have not seen material 

 of this species, of which Cotteau says it is common in the Eocene 

 deposits of Santa Lucia, Province of Santa Clara, Cuba. 



Genus ECHINOLAMPAS Gray, 1825. 



Type species. Echinanthus ovatus Leske, 1778, Add. ad Klein, p. 127. 



There are many fossil species of this genus in the West Indies and 

 the characters run so close they are hard to distinguish. H. L. Clark 

 (1917, Mem. Mus. Com. Zool., vol. 46, No. 2, p. Ill) also says that the 

 Recent species of this genus are very hard to distinguish from one 

 another. None of the fossil species is at all near to the Recent species 

 of the West Indies. 



Key to the West Indian Fossil Species of Echinolampas. 



Size very large; ambitus nearly circular; test high E. semiorbis 



Size moderate or small; ambitus more or less elliptical or oval. 



Lateral margins of interporiferous areas of petals straight and diverging. 



Periproct marginal; interporiferous areas of petals flat E. ant Mar urn 



Periproct submarginal; interporiferous areas of petals slightly tumid E. ovumserpentis 



Lateral margins of interporiferous areas of petals convex, converging slightly near the tip. 

 Test long, narrow; petals, especially the posterior pair, short; peristome anterior, 



periproct marginal E. clevei 



Test wider; petals longer; peristome central or subcentral. 



Test more or less flattened, or if high, not at all subconical; petals short, wide, with 



unequal or subequal poriferous areas; peristome only a little sunken.. E. lycopersicus 

 Test high and subconical; poriferous areas of lateral petals often quite unequal. 

 Height of test 60 per cent of length; poriferous areas of posterior petals about 



equal; peristome slightly sunken E. castroi 



Height of test about 50 per cent of length; poriferous areas of posterior petals 



quite unequal; peristome deeply sunken E. anguillat 



