I. '08. 20 



Of the six species of Amalopenaeus and Gennadas known 

 from Atlantic waters, this specimen undoubtedly stands nearest 

 to vaiens. It differs, however, from Bouvier's account and 

 figures of that species (1908) in respect of numbers 5 and 8 of 

 the characters mentioned above. The second maxilla is also 

 different, and appears to resemble that of A. eJegans far more 

 closely than Bouvier found to be the case in vaiens. In this 

 appendage the narrow terminal prolongation of the endopod 

 is provided with a tuft of setae, and bears two pairs of curved 

 dorsal spines. The anterior lobe of the internal lacinia is 

 slightly constricted behind its apex, and is distinctly narrower 

 than the adjacent lobe of the external lacinia. The thelycum 

 is certainly widely different from the typical form known in 

 miens, but Bouvier states that considerable variation exists 

 and has figured (1908, PL ix, fig. 20) an example which in 

 this respect shows a good deal of resemblance to that figured 

 above ; the female of a very closely allied species, described as 

 Gennadas Talismani (Bouvier, 1906), is, however, unknown, 

 and it is consequently impossible to determine this specimen 

 with any degree of confidence. 



The specimen was found under the following circum- 

 stances : — 



HeJga. 



S.R.590.— 3/8/'08. 51° 51' 30" N., 12° 8' W. Soundings 

 480 fathoms. Midwater trawl, 0-480 fathoms. 

 Temperature at 450 fathoms, 9'28°C. , salinitv 

 35-46^/o.,.— One, 48 mm. 



Amalopenaeus vaiens has been recorded from the east coast 

 of the United States, lat., 37^ 16' N., long., 74° 20' W. 

 (Smith), and from the W. coast of Portugal, W. coast of 

 Morocco, the Azores, the Canary Is., and the Sargasso Sea 

 (Bouvier). 



Genus Solenocera, Lucas. 



PI. II, Figs. 1-8. 



Solenocera siphonocera (Philippi). 



Penaeus memhranaceus , H. Milne Edwards, 1837 (nee 



Eisso). 

 Penaeus siphon oc ems , Philippi, 1840, PI. iv, fig. 3. 

 Solenocera Philippi, Lucas, 1850, PI. vii, fig. 2. 

 Penaeus siphonocerus, Heller, 1863, PI. x, fig. 12. 

 Solenocera siphonocera, Caiman, 1896. 

 Solenocera memhranacea, Bouvier, 1908. 



The rostrum is very slightly upturned at the apex and 

 reaches almost to the tips of the eyes ; it is armed on its 

 superior margin with five to seven forwardly directed teeth, 

 three or four of which are situated on the carapace behind the 

 posterior edge of the orbit. On its inferior margin the 



