114 Kev. T. R. R. Stebbine: on new 



& 



pods of A. littorina) and though this form is less conspicuous 

 than the other for beautiful fringes of shining hairs on various 

 parts of the meros, the wrist, and the hand, it nevertheless 

 has these fringes, only of less length, and, what is more, has 

 them disposed just as they are in the other species : in both 

 gnathopods they are set round the distal extremity of the meros 

 and distally round the back and front of the wrist, on the back 

 and front margin of the hand, on the palm, and on the inner 

 side of both hand and wrist. The antenna? also are adorned 

 with similar hairs — long ones at the articulations of the 

 peduncle, and short tufts or fringes at intervals round the 

 cylindrical or subcylindrical pieces which compose it : these 

 ornaments, again, are shorter and less attractive in A. lit- 

 torina. 



In the l British Sessile-eyed Crustacea' there is a slight 

 difference in the figuring of the telsons of the two forms — a 

 difference, however, not again mentioned by Mr. Spence Bate 

 in his British-Museum Catalogue. The specimen of which I 

 have drawn the tail-piece appeared to be A. rubricata, but was 

 taken within tide-marks. The telson differs from both the 

 forms previously figured, being truncate and indented at the 

 distal end. The stems of the last pair of pleopoda have their 

 distal ends toothed or crenated. 



On the whole we may, I think, accept these two species as 

 an example of those insensible gradations between varying 

 forms of a common origin, in which some persons find it so 

 difficult to believe. 



Sunamphithoe gammaroides (male and female). Pis. XI. & 



XII. figs. 3, Sa-f. 



This species is probably the same as Mr. Spence Bate's 

 Amphithoe gammaroides , which, however, was described and 

 named from "dried and imperfect specimens" not exhibiting 

 the telson, in the shape of which consists the one generic 

 distinction between Amphithoe and Sunamphithoe. 



My specimens were taken throughout the year in rock-pools 

 at Meadfoot and Goodrington, Torquay. The colouring is a 

 bright yellowish green, with sparse but conspicuous black dots, 

 chiefly on the coxas. In these respects and in the shape of the 

 pereiopoda they agree with Amphithoe gammaroides. The 

 eyes, however, are not black but red — a point of minor import- 

 ance, as the colour of the eyes seems to vary in more than one 

 species. The peduncles of the antennas agree approximately : 

 in the upper pair the second joint is scarcely so long as the 

 first, in accordance with the figure, but not with the description 



