PROCEEDINGS OF UNITED STATES NATIONAL MUSEUM. 435 



mm. 



Length of left propodua 9. 



Breadth of right propodus (i.O 



Breadth of left propod us 3.1 



Length of right propodal digit 4. .'j 



Length of left propodal digit 4.0 



Length of right dactylus 8. 



Length of left dactylus 5. 2 



Length of telson 5. 5 



Breadth of telsou 3. d 



Stations 873 and 878 ; 100 and 142 fathoms. 



This species is at once distinguished from A. stirynchus and A. serratus 

 by the narrower and acuminate rostrum, the teeth on the dorsal carina, 

 the form of the chelipeds, and the more slender second, third, and fourth 

 pairs of legs. In A. stirynchus and serratus the carpus in the second 

 pair of legs is short, expanded distally, and less than half as broad as 

 long, and the chela is nearly or quite half as broad as long. 



Axius serratus Stimpson (Proc. Boston Soc. Nat. Hist., iv, p. 222, 1852; 

 Smith, Trans. Conn. Acad., v, p. 55, pi. 10, fig. 4, 1879) was dredged the 

 past season from the "Fish Hawk", in 20 fathoms, sandy bottom, in 

 Narragansett Bay; and large specimens, taken on George's Banks, have 

 been presented to the National Museum by Capt. John Q. Getchell and 

 crew of the schooner "Otis P. Lord", of Gloucester, Mass. 



These specimens show that Stimpson's species is distinct from the Eu- 

 ropean stirynchus. The serratus is at once distinguished by its broad 

 and depressed abdomen, which expands laterally in the middle, and is 

 much broader than the carapax. The fourth segment of the peduncle 

 of the antenna and the acicle are both proioortionally much longer in 

 serratus than in stirynchus, being nearly as long as in the species just 

 described. The upper edge of the propodus in both chelipeds is thin 

 and strongly carinated in serratus, but thick and rounded in stirynchus, 

 and the smaller cheliped is much narrower and has much longer and 

 more slender digits in serratus than in stirynchus. 



Pontophilus Norvegicus M. Sars. 



Stations 869, 870, 880, 881, 893, 894, 895 ; 155 to 372 fathoms. 



The largest females are 74'"™ long, the largest male 47""". Several of 

 the specimens belong to the variety with the broad and obtuse rostrum 

 described by Sars. 



Pontophilus brevirostris, sp. nov. 



Very closely allied to P. spinosus and P. Norvegicus, but readily dis- 

 tinguished from both these species by the very short rostrum, which is 

 tridentate, with the median tooth scarcely broader and very little longer 

 than the lateral, about reaching to the cornea of the inner side of the 

 eye and not projecting beyond the line of the spiniform outer angles of 

 the orbits. The proportions of the body are more like spinosus than 

 Korvegicus, but the carination and armature of the carapax are more 



