CUUSTACEA. 



Order Pycnogonoidea. 



135 



Fam. Pycnogonidae, Latreille. 

 Genus Ptcnogonum, Briinnich. 

 Pycnogonum littorale, O. F. Mtiller. 

 Abundant under stones between tide-marks. 



Genus Phoxichilidium, M.-Edwards. 

 PhoxicMlidium femwatum, Ratlike. 

 Occasionally under stones in rock-pools, and ranging to 

 deep water. 



Besides the foregoing, there are several species (one appar- 

 ently identical with Mr. Goodsir's Nymphon Johnstoni, and 

 another with his N. spinosum) not uncommon in the coralline 

 region. Many delicate zoophytes are foimd on their limbs. 



Order Cieripedia. 



Suborder SUCTOEIA. 



Fam. Peltogastridae, Glaus. 



Genus Peltogaster, H. Rathke. 

 Peltogaster jpaguri^ H. Rathke. 

 Occasionally on Pagurus hernhardus. A more elongated 

 form occurs on P. cuanensis. 



Genus Sacculina, Thompson. 

 Sacculina carcini, Thompson. 

 [Plate IX. fig. 13.] 

 Common on the abdomen of Carcinus mamas. Anotlier is 

 found on PuHunus holsatus (Plate IX. figs. 14 & 15). 



