146 LIVERPOOL MARINE BIOLOGY COMMITTEE REPORT. 



This is the Borlasia nigra of Byerley's list. 



Borlasia octoculata, Johnston. 

 Lineus scmguineus, Rathke. 

 Eecorded by Byerley as having been found by Mr. 

 Weightman on oysters. 



Class. — Nematelmia. 

 Order.— CH/ETOGNATHA. 



Sagitta hipunctatay Quoy and Gaimard. 

 This form was found in abundance by tow-netting off 

 Port Erin. During July and August it seems to have 

 occurred in greatest quantity when the water was rather 

 rough and while a strong breeze was blowing. It does not 

 occur in Byerley's list. 



Class.— Gephyrea. 

 Order.— CH/ETIFERA. 



Thalassema sp. (?). 

 One specimen of a species apparently belonging to the 

 genus Thalassema was obtained at the entrance to the Menai 

 Straits on the " Hyaena " expedition. The body had a length 

 of 10 mm., while the sheath of the proboscis measured 

 25 mm. The sheath was grooved and, though swollen 

 at the end, not bifurcated. The body was smooth poste- 

 riorly, but bore two spines anteriorly, ventrally placed 

 and recurved. The alimentary canal was coiled, but the 

 anus was terminal. I have not been able to make out as 

 yet whether the species is one already described, and post- 

 pone further observations till I have investigated that point. 



Class.— Annelida. 



Sub-class.— Hirudinea. 



Family.— Rhynchobdellid-s:. 



Pontobdella muricata, Linnaeus. 



