CRUSTACEA. 135 



Order Pycnogonoidea. 



Fam. Pycnogonidae, Latreille. 

 Genus Pycnogonum, Briinnich. 

 Pycnogonum littorale, 0. F. Miiller. 

 Abundant under stones between tide-marks. 



Genus Phoxichilidium, M.-Edwards. 

 PhoxicMUdiuvi femoratum^ 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 Nymplion Johnstoni, and 

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

 region. Many delicate zoophytes are found on their limbs. 



Order Cirripedia. 



Suborder SUCTORIA. 

 Fam. Peltogastridae, Glaus. 



Genus Peltogaster, H. Rathke. 

 Peltogaster paguri, H. Kathke. 

 Occasionally on Pagurus hernhardus. A more elongated 

 form occurs on P. cuanensis. 



Genus Sacculina, Thompson. 

 SaccuUna carcini, Thompson. 

 [Plate IX. iig. 1.3.] 

 Common on the abdomen of Carcinus mcenas. Another is 

 found on Portunus holsaius (Plate IX. figs. 14 & 15). 



