THE BAENACLES IN THE V. S. NATIONAL MUSEUM. 45 



as the somewhat concave margins ag^ain^t the carinal and rot<tral latera. 

 The umbo is elevated and at the upper fourth of the plate. From 

 it obtuse ridges radiate to the two basal angles of the plate. 



The carinal latus is somewhat triangular. Its apical half projects 

 free behind and below the carina, ilaring strongly outward and notice- 

 ably twisted. Apex acute. In dorsal view the carina is seen to 

 extend between the horn-like latera nearly to the peduncle. The 

 spread from apex to apex of the two carinal latera is 6 mm. in the 

 type specimen. 



The peduncle is short, covered witli rather large scales in about 13 

 rows of about S scales each. 



Length of the capitulum 11.6, breadth 7 mm. Leng-th of the peduncle 

 6 mm. Length of carina 12 mm., diameter near base 1.7 n)m. 



The laterally-flaring-, horn-like carinal latera, the wide sides of the 

 carina, and the position of its umbo, as well as the more or less ruddy 

 color, all distinguish this fine species. (Fig. 13.) 



SCALPELLUM DICERATUM new species. 



T(/pe.—Csit No. 11181 U.S.N.M. 



Type-locality. — Albatross Station 2319-23.50, off Habana, Cuba, on 

 crinoid arms. 



(nher locaUties.—i:^. No. 32867. Albatross Station 2405, Gulf of 

 Mexico, west of Florida, 30 fathoms. No. 32868. Albatross Station 

 2324, oft' Habana, 33 fathoms, on a Cidaris spine. No. 32869. Alba- 

 tross Station 2315, Straits of Florida, 37 fathoms. No. 9474. Albatross 

 Station 2317, Straits of Florida, north latitude 24° 25' 45", west longi- 

 tude 81° 46', in 45 fathoms, temperature 75° F., on the spines of 

 Cidaris. 



The capitulum is similar in shape and general appearance to that of 

 S. arietinuiiL. The ventral margin is nearl}' straight, but with a low 

 prominence in the middle. It is more or less deeply crimson tinted, 

 but varies to creamy white in some individuals. 



The scutum has a terminal mucro, and is shaped like that of N. arie- 

 tinmn. The tergum is also like that of S. arietiniuu. 



The carina is well arched, with an acute.) apical in/tbo, ivhich Intrudes 

 betimen the terga. The roof is convex, with about 8 arcuate, trans- 

 verse hair tufts, as in S. arietinum. The sides are bicostate and very 

 narrout., not widened al)ove. Basal margin rounded. 



The upper latus is pentagonal, the scutal margin longest, the tergal, 

 carinal and basal successively^ shorter, the margin against the infra- 

 median plate shortest, less than half the basal margin. The umbo is 

 acute and terminal. 



The rostrum is very small and triangular. The rostral latus is 

 shaped like that of S. ariefhnnii. It has two low ridges running from 

 the apex to the upper and lower angles of the lateral end of the plate. 



