3°2 



DISCOVERY REPORTS 



Caprellinoides mayeri (Pfr.) (Fig. 167). 



Pfeffer, 1888, p. 137, pi. iii, fig. 4 (immat.). 



Mayer, 1890, p. 88, pi. v, figs. 57, 58; pi. vi, figs. 15, 26; pi. vii, fig. 48. 



Chilton, 1913, p. 61. 



? Mayer, 1903, p. 59 (Piper ella grata). 



Occurrence: 1. St. 39. South Georgia. 1 $ 12 mm. 



2. St. 42. South Georgia. 4 ^ 11-14 mm., 6immat. $?S-ii mm., 1 ovig. ? 9 mm., 



3 juv. 6-7 mm. 



3. St. WS 33. South Georgia. 1 ovig. $ 10-5 mm., 1 juv. 4 mm. 



Description. Eyes recognizable only by the lenses. Medio-dorsal spines in middle 

 (or just behind middle) and on hind margins of segments 2, 3 and 4. No spines on head 

 or on segment 5. A fine sparse pilosity on segments 2-6, chiefly dorsally, often ap- 

 parently obsolete ventrally. In the juveniles the dorsal spines are represented by mere 

 tubercles, and very young specimens are probably quite smooth. 



Fig. 167. Caprellinoides mayeri (Pfr.). a. General view of o (St. 42). 

 /;. Gnathopod 2 cJ (St. 39). c. Gnathopod 2$ (St. 42). 



Antenna 1, flagellum 13-14-jointed in <$, n-jointed in ?. Antenna 2, flagellum 

 6-jointed in g, 5-jointed in $. In juveniles the number of joints is less. 



Gnathopod 2, 6th joint with palmar margin concave, parallel with dorsal margin, 

 setose, one pointed and one truncate tooth near hinge; in $ 6th joint ovate, palm slightly 

 convex, setose, with one or two small teeth near hinge. 



Remarks. I think there can be no doubt that these specimens are the adults of 

 Pfeffer's species described from South Georgia, though none of them are as robust as 

 shown in Pfeffer's figure, and the dorsal spines are better developed. 



The 2nd gnathopod in the ? has an evenly convex palm, without or with only small 

 teeth near the hinge ; that of the young <$ is like Mayer's figure ; that of the adult S has 

 a concave palm. 



The c? from St. 39 is very slender and has no trace of dorsal spines or tubercles; the 

 hand of gnathopod 2 (Fig. 167 b) shows a variant of the form found in the specimen from 

 St. 42. This specimen has the further peculiarity of only six joints in the flagellum of 

 antenna 1, and two joints in that of antenna 2. Thus it seems to have preserved its 

 juvenile characters while developing the adult form of gnathopod 2 earlier than usual. 



