70 FOSSIL ECHINI OF THE WEST INDIES. 



ventral side can be seen, as that area is quite gone. The surface of the 

 test is covered with small, rather widely scattered tubercles, more closely- 

 associated near the ambitus. Small granules which doubtless existed 

 between them are quite wanting, as the surface of the test is much worn. 

 Length, 91 mm., width, also 91 mm., the height as it stands measures 

 32 mm., but this is somewhat less than the original height of the single 

 known specimen, which is worn away ventrally. 



This is the only species of the genus so far found fossil in the West 

 Indies. It is very much larger and does not make a near approach to 

 any species known in American formations. 



Cretaceous, from high slopes in the valley of Rio Yateras, about 21 



miles northeast of Guantanamo, Cuba, holotype, C. T. Ramsden 



collection. 



Family HEMIASTERID^ H. L. Clark, 1917. 



Genus AGASSIZIA Valenciennes, 1846. 



Type species. — Agassizia scrobiculata Valenciennes, 1846, Voyage de 

 la Venus, Atlas, Zoophytes, plate 1, figs. 2 to 2/. 



Key to the West Indian Fossil Species of Agassizia. 



Test high, conical, arched anteriorly, plastron strongly elevated A. inflata 



Test high, rounded, sloping anteriorly, plastron not elevated A. clevei 



Agassizia inflata, new species. 



(Plate 12, Figures 2 to 4.) 



Agassizia clevei Cotteau (pars), 1875, Kongl. Sven. Vet. Akad. Handl., vol. 13, No. 6, p. 

 33, plate 6, figs. 9, 10, non 2 to 8. 



The following is a description of this species : 



Species of small size, obovate; very widely rounded anteriorly; rounded 

 but much narrower posteriorly; upper face very high, subconical; arched 

 anteriorly from the apical disk to the ambitus; the greatest height is 

 through the apical disk; posterior face truncate, nearly vertical. The 

 sternum is strongly projecting, increasing in elevation to the anterior end 

 of the plastron. The apical disk is excentric posteriorly; anterior furrow 

 slight, but well marked dorsally, but it does not extend to the ambitus. 

 The anterior ambulacrum III is straight and narrow, the plates higher than 

 wide, with small pores near the middle of each plate. Ambulacra II and 

 IV, the anterior pair, are very peculiar, the anterior half-ambulacrum 

 being reduced to very narrow plates, nearly atrophied dorsally, with very 

 small rounded pores. The posterior halves of ambulacra II and IV are 

 much more obvious than the anterior halves, and extend farther toward 

 the ambitus. The plates are low, relatively wide, with two vertical rows 

 of large oval pores. The angle of divergence of ambulacra II and IV is 

 less than that of A. clevei. The posterior ambulacra I and V are sunken 

 in slight furrows, are longer than in clevei, and have relatively large oval 

 pores, much as in the posterior halves of II and IV. Where not worn by 

 erosion, small tubercles cover the test, being more closely crowded near 

 the ambitus. The apical disk is small, but details can not be ascertained 

 in this specimen excepting for the 4 genital pores, which are obvious. The 

 periproct, transversely oval, is situated in the posterior face and is just 

 visible from above; the peristome is semicircular, labiate, and situated 



