40 BULLETIN 60, UNITED STATES NATIONAL MUSEUM. 



The rostrum is small and triangular or oblong as liigh as the rostral 

 la t era. 



The rostral latus is trapezoidal, its length about double the height. 

 The rostral margin is much shorter than the lateral and the scutal 

 margin is longer than the basal. 



The inframedian latus is oblong, its height decidedly over twice the 

 width, trapezoidal, with the umbo raised, close to the rostral border 

 of the plate, at its upper third. The upper end of the plate presents 

 a very short face to the angle of the scutum and a longer one against 

 the upper latus. 



The carinal latus is triangular in general shape, though with five 

 sides. The basal and carinal margins are longest; the upper and 

 lateral margins shorter and subequal. The short margin below the 

 carina is arched, and projects slightly l)eyond the carinal outline. The 

 umbones are below the lower fourth of the dorsal border of the plate. 



The peduncle is short, oblicpie to the capitulunx, and covered with 

 imbricating scales in about 13 rows. 



Length of the capitulum 8, breadth 8.7 mm. Length of the pedun- 

 cle 2.6 mm. Length of the carina 7.2, diameter at base 1.1 mm. 



This little species is related to S. cp'uvelianuin^ but it is distinct by 

 the longer, narrower capitulum with consequent diU'ei'ences in the 

 shapes of the individual plates. The umbo of the inframedian latus 

 is not apical, the carina is less curved, and the rostrum is well 

 developed. S. sa7ictij>etrenxe has also nuich resemblance to the Atlan- 

 tic S. longicarinaturn . 



Four specimens, of about equal size, were taken. 



In some the rostrum is distinctly triangular, in others more of an 

 oblong shape. (Fig. 10.) 



SCALPELLUM GRUVELIANUM Pilsbry. 



1907. >S'. gruvelianurn Pilsbry, Bulletin of the Bureau of Fisheries, XXVI, p. 197, 

 pi. VII, figs. 1-3, Southwest rock, Santa Barbara Island, 238 fathoms. 



In addition to the type-locality, this species was taken at Alhafross 

 stations 2980, 603 fathoms, and 2947, 269 fathoms, both off southern 

 California. There is a miimte rostriun in some examples, but in 

 others it cannot be distinguished. 



(IROIJP OF SCALPELLUM RATHBUNJi:. 



Forms similar to the group of S. jmrtoricmmiii except that the 

 inframedian latus has a peculiar and characteristic shape. 



SCALPELLUM RATHBUNiS:, new species. 



%>6?.— Cat. No. 32912 U.S.N.M. 



TyjJe-locality. — Albatross Station 2768, ofl' the east coast of Pata- 

 gonia, south latitude 42^ 24', west longitude 38"^ 30', in 43 fathoms. 



