34 



BULLETIN 60, UNITED STATES NATIONAL MUSEUM. 



The rostruiii is comparatively large, in shape of an isosceles triangle. 



The rostral latus is low and wide, its surface divided by a diagonal 



rib. 



The inf raniedian latus is narrow, obliquely triangular, tapering to 



the apex, w hich curves toward the scutum and overlies its baso-lateral 



angle. The umbo is apical. 



The carinal latus is pentagonal, curved like a scoop, with the apex 



projecting outward beyond the carina. Three subequal faces abut on 



the upper and inframedian latera 

 and the peduncle, the upper 

 margin being longest. Behind 

 the carina the two latera meet 

 only at the base. 



The peduncle is stout and very 

 short, very closeh^ covered with 

 projecting scales, in about 8 

 deeply interlocking rows of 6 or 

 7 scales each. It is inconspicu- 

 ously hair}'. 



Length of the capitulum 9, 

 breadth 5 mm.; length of the 

 carina 6.8, diameter near the 

 base 1.8 mm.; length of the pe- 

 duncle about 2.8 mm. 



This peculiar little species is 

 represented by one example 



only, but it is so unlike any described form that I do not hesitate to 



describe it. The large size of the rostrum for a species of this group, 



the curious shape of the carinal latera, the short carina, and the color 



are its main characteristics. (Fig. 7.) 



GROUP OF SCALPELLUM PORTORICANUM. 



This group is characterized by the shape of the carinal latus, which 

 is as high as wide, with the umbo at or below the middle of the cari- 

 nal margin, and by the uniformh' small size of the species. It com- 

 prises /S. tritoiiis Hoek, po7'toricanum Pilsbry, longicarmatum Pilsbry, 

 and atlanticum Gruvel, of the Atlantic, and S. truncatwn Hoek, 

 gruvelianmn Pilsbry, and saiietipetrense Pilsbry, of the Pacitic. 



SCALPELLUM TRITONIS Hoek. 

 1883. S. tritonis Hoek, Challenger Rep., Cirripedia, p. 122, })1. v, figs. 9, 10. 

 TopoUjpe.—OdX. No. 32866, U.S.N. M. Triton Station 10, Faroe 

 Channel, north latitude 59° 40', west longitude 7° 21', 516 fathoms, 

 in the "warm area" west of the ridge, bottom temperature 46°. 

 August 24, 1882. Jeffreys collection. 



A specimen in the Jeffrey's collection was taken in the same haul 

 which furnished the two individuals upon which Hoek based the 



Fig. 7. — Scalpelli'm gorgoniophilum. a, lateral 



VIEW X 4; ft, DETAIL OF ROSTRrM. 



