NO. 3 BARNARD: THE PHOXOCEPHALIDAE 295 



Phoxus Kroyeri Stimpson 1853: 58; Bate 1862: 101; Smith 1873: 556. 

 fPhoxus simplex Bate 1857: 525 (also see Metaphoxus pectinatus) ; 



?Robertson 1888: 27-28. 

 Phoxocephalus Holbolli, Sars 1895: 144-145, pi. 49; Norman 1900; 

 334; Norman 1902: 480; Reibisch 1905: 166; Scott 1906: 148. 

 Stephensen 1928: 135-137, fig. 26, 1-12. 

 Phoxocephalus holbolli, Holmes 1905 : 477, fig. 

 Phoxocephalus Holboellii Stephensen 1917: 130. 

 Phoxocephalus holboelli, Oldevig 1933: 81. 

 Phoxocephalus Holbolli, Dons 1935 : 107. 



Phoxocephalus holbolli, Patience 1909: 125-130, pi. 4, fig. 1 (in part) ; 

 Bjorck 1915: 14-15; Derjugin 1915: 444; Kunkel 1918: 74-75, 

 fig. 12; Stephensen 1925: 159-160; Stephensen 1926: 59; Schneider 

 1926: 16-17; Stephensen 1929: 85, fig. 21, 101; Stephensen 1929a: 

 4; Shoemaker 1930: 44-45; Schellenberg 1934: 131; Gurjanova 

 1935: 73; Stephensen 1940: 19-20; Schellenberg 1942: 173-174, 

 fig. 143; Stephensen 1944: 52; Gurjanova 1951: 263-264, fig. 

 214; Bousfield 1956: 137. 

 Phoxocephalus holbolli Stephensen 1938: 148-149. 



(Additional references to the species are to be found in Shoemaker 

 1930). 



Diagnosis. — Eyes composed of a mass of whitish pigment cells, 

 no lenses; perasopod 3, article 2 stout; epimera of pleon segment 3 

 only slightly convex behind, subquadrate, smooth except for tiny setules; 

 rami of uropod 1 equal in length ; posterior lobe of article 2 of peraeopod 

 5 expanding distally. Gnathopods rather small. 



Remarks. — See the discussion under "Phoxocephalus" for the prob- 

 lems of classification posed by this, the type species of the genus. 



In the material examined by me, large specimens of both sexes ap- 

 proaching 6 mm in length have the second gnathopod noticeably larger 

 than the first but in smaller specimens and in Sars' figures they are 

 nearly the same size. In immature animals of most other species 

 of Phoxocephalus there are distinct differences in configuration or size 

 of the gnathopods. 



In male specimens the rostrum is very slightly downturned and 

 the apex from the lateral view slightly broader than in the female. The 

 eye appears to be a small mass of 10-20 poorly defined cells, no crystal- 

 line lenses. The first and second uropods add spines on the rami in 

 animals approaching 5 mm in length. The epistome is rounded in 

 front. 



