CRUSTACEA MALACOSTRACA. 



good reason considers a local variety and calls P. sculptus pacificus Fax., from the Pacific off the west 

 coast of America between Ecquador and the northern tropics, depths from 511 to 1270 fm. 



Remarks. The single specimen is a male 84 mm. long; it agrees excellently with Smith's description. 



34. Polycheles nanus Smith. 



1884. Pentacheles nanns S. I. Smith, Rep. Comm. Fish & Fisher, f. 1882, X, p. 359. 



! 1886. S. I. Smith, f. 1885, XIII, p. 651, PI. VII, figs, i i a. 



1895. Polycheles Faxon, Mem. Mus. Comp. Zool., Vol. XVIII, p. 121, PI. XXXIII, figs, i, i a, i b. 



Occurrence. The "Ingolf" has taken this species at the following 12 stations. 

 Davis Straits: St. 36: 61 50' N. L,., 56 2i'W. L-, 1435 fm., temp. 1-5; 2 spec. 

 West of Iceland: St. 10: 64 24' N. L., 28 50' W. L., 788 fm., temp. 3-5; 2 spec. 

 South-West of Iceland: St. 18: 6i44'N. L., 30 29' W. L., 1135 fm., temp. 3-0; 6 spec. 



- 83: 62 25' 28 30' 912 3-5; 10 spec. 



- 76: 60 50' 26 50' 806 - 4-1; 3 



- 74: 62 17' 24 36' 695 - 4-2; i 

 South of Iceland: St. 68: 62o6'N. L., 22 30' W. L., 843 fm., temp. 3-4; i spec. 



- 67: 6i30 r 22 30' 975 - 3-0; 2 



- 40: 62 oo' 21 36' 845 - 3-3; 3 



- 66: 6i33' 20 43' 1128 - 3-3; i 



- 64: 62 06' 19 00* 1041 3'I; 2 



- 41: 6i39' 17 10' 1245 ' 2 '> * 

 Distribution. S. I. Smith mentions the species from a large number of stations off the east 



coast of America between ca. 35 and 41 N. L,. in depths from 707 to 1917 fm.; Caullery notes it from 

 a station in the Gulf of Gascogne in the relatively small depth of 355 fm., and Stebbing from South 

 Africa, not far from Cape Point, 750800 fm. Faxon notes it from the Pacific off the west coast of 

 America between o 36' S. L. and 7 I / 4 N. L,. in depths between 899 and 1522 fm. The species has thus 

 been taken once in ca. 355 fm. but otherwise in the most different depths between 695 and 1917 fm. 



Remarks. The largest "Ingolf specimen, a female with eggs, is 74mm. long and came from 

 St. 40; two other females with eggs measure 55 and 59-5 mm. in length and are from St. 18 and St. 41. 



When Smith founded the species and gave good characters for it, he remarked at the same 

 time that it "will possibly prove to be only a dwarf deep-water variety of P. sculptus" but witli 

 this I cannot agree. My "Ingolf material is very considerable and gives no indication of P. nanus 

 being a variety. Further, Smith himself says: "the distinctive characters are well-marked and very 

 constant in all the large number of specimens seen". Faxon states that his sixteen specimens from 

 the Pacific differ from Atlantic specimens in that the keels and tubercles on the 6 th and 7 th abdominal 

 segments are lower than in the latter, and he adds: "In these regards the Pacific form resembles 

 P. sculptus, adding weight to Professor Smith's suggestion that P. nanus may be only a dwarf deep- 

 water variety of P. sculptus". The characters indicated by Faxon appear to me however so unim- 

 portant in comparison with the remaining characters that P. nanus must remain an independent 

 species well-marked off from P. sculptus. 



