126 TANAIS. 



we have but little hesitation in referring to it the 

 specimens from the South Coast of England, Berwick 

 Bay, and Glasgow, agreeing as they do with a specimen 

 in the Hope Collection at Oxford, bearing the label 

 of that name in the handwriting of, and most probably 

 collected by, Signer Costa, in the Bay of Naples.* 

 There are, however, several characters in which our 

 specimens agree so closely with those described below 

 under the name of Paratanais Dulongii, that we 

 should not be surprised if it should be ascertained 

 that (notwithstanding the remarkable clothing of the 

 basal segments of the tail) these individuals should 

 prove to be the females of the former. We were 

 at first, indeed, disposed to regard these specimens as 

 being the T. tomentosus of Kroyer, from the Norwe- 

 gian Sea, but that species is described as having " omnes 

 fere corporis partes pilis longissimis crispis obsitse," 

 which is certainly not the case with our specimens. 

 It must, however, be observed that some of our speci- 

 mens of large size are entirely destitute not only of 

 the ventral scales forming the incubatory pouch, repre- 

 sented by Rathke and Miiller, but also of the appen- 

 dages alluded to above as representing the branchiae 

 according to Mr. Spence Bate. 



The general proportions of the animal agree with those 

 of T. Dulongii, except that the body is comparatively 

 somewhat more robust. The head is broader than in 

 T. Dulongii. The relative size of the two pairs of an- 

 tennae are shown in the above woodcut, the upper pair 

 having a slight rudimental flagellum concealed among 



* In his description Prof. M. Edwards describes the three first segments 

 of the abdomen as "tres poilus lateralement," but the rudeness of his 

 figure leads us to infer that the hairs extend to the dorsal surface of those 

 segments. 



