ADDITIONS AND CORRECTIONS. 215 



P. 73. Add Psolus tenema. 

 P. 92. After Flemingiaplumosa, add 

 Grossostoma (Gosse). Upper margin of mouth, 

 set with cirri ; segments thirty, the fore ones 

 furnished with bristles, feet, and superior cirri; 

 inferior cirri from the fourth segment to the tail, 

 ear-like, cleft ; eight tentacles on the second and 

 third segments; tail furnished with a pair of 

 minute styles. 



C. Midas. 



P. 94. After Sabella chorcema, add 

 Protula (Griibe). Gill-fans two, each composed 

 of four thick, soft, doubly-pectinate, radiating 

 stems ; their united base surrounded by a fleshy, 

 reverted collar ; body flat, divided into thorax and 

 abdomen, composed of many segments ; inhabiting 

 a shelly tube, equally thick throughout, open at 

 each end ; many tubes crowded into a contorted 

 mass, attached to submerged bodies. 





P. Dysteri. 



P. 103. After Nereis versicolor, add 



Crithida (Gosse). Antennae five, very large, 

 viz., a frontal pair, which are bulbous at base, and 

 two-branched, and three occipital ones, which are 

 very thick, tapering to a blunt point, and long ; a 

 pair of tentacular cirri on the head ; two large 

 eyes ; feet ovate, very moveable, each with a 

 thread-like cirrus above, a pencil of short bristles, 

 and a second pencil of long straight bristles. 



C. thalassina. 



