74 NATURAL HISTORY BULLETIN 



sets are in contact. The radials are pentagonal. In this cen- 

 tral area are no papular pores, but a large one stands next to 

 the suture between the radials and basals. 



The carinal row, beyond the basal, has five pentagonal plates. 

 The proximal lobe overlaps the edge of the preceding plate, and 

 has a papular pore each side of it. The other dorsal plates, sim- 

 ilar in form, are in oblique short rows that run from the carinal 

 to the marginal plates ; the first row has three plates ; the second 

 and third two plates each. 



There are isolated papular pores each side of the plates of the 

 first row, forming four radial rows of pores. There axe also 

 two rows of small interradial plates. 



The dorsal plates mostly bear from one to three small spines. 

 No pedicellarige were found. 



The superomarginal plates are four to each side of a ray ; they 

 are longer than wide, destitute of a marginal row of spinules, 

 but bear small scattered spinules. The ocular plate is rather 

 large, ovate, unarmed. The inferomarginals are five to each side 

 of a ray. They are longer than wide and each bears a row of 

 five to seven marginal spinules, which are short and divergent, 

 forming a marginal fringe. The distal plates are very small. 



The few interactinal plates form two chevrons. The first has 

 no impaired interradial, each of its halves has five plates ad- 

 joining the adambulacrals and larger than the latter, so that one 

 corresponds to two adambulacrals. 



The second chevron has an impaired interradial plate, and 

 each half has two plates; a second odd interradial lies opposite 

 the median suture of the inferomarginals. These plates are not 

 imbricated and each usually bears two small central spinules. 



The adambulacral plates project into the groove and the 

 inner edge bears a divergent row of three to five small spinules ; 

 on the actinal side they bear a somewhat oblique transverse row 

 of two or three somewhat larger spinules. 



The jaws are elongated, each half bears a large terminal or 

 peroral spine and a row of four smaller graded adorals; also 

 one enlarged epiora.l, inclined toward the mouth, 



Blake Station 278, in 69 fathoms, off Barbados (3 specimens.) 



This species seems to be nearest Poraniella, but the cotypes, 

 which I have examined, are all evidently very young. Thus the 



