ON THE MARINE ZOOLOGY OF THE IRISH SEA. 529 



hind margin in this species is much shorter, and rises from nearly the 

 centre. There is also a prominent tooth near the centre of the hind 

 margin of the " finger," which is very characteristic. The female re- 

 sembles P. minutus. Length, 3 mm.' 



3. Laxey Bay, 8 fathoms, on the ' Zostera ' bed : Here were Gam- 

 panularia angulata, Membranipora spinifera, Cellepora ramulosa, Pedi- 



FiG. 2. — Second Gnathopod of Male Amphipods. 



Podocerus minutus (after Sars). P. Herdmani, n. sp. 



cellina gracilis, and various other hydroids and polyzoa, some compound 

 ascidians, Cerapus difformis, and a considerable number of very large 

 living Pectunculus glycimeris. 



The ascidians dredged in this expedition yielded a number of parasitic 

 copepoda, amongst which were Botachus cylindratus, Notopterophorus 

 papilio, Doropygus pulex and D. poricauda, Notodelphys Allmani, and 

 Ascidicola rosea. 



II. On November 12 the dredging was, on account of the weather, 

 confined to the immediate neighbourhood of Port Erin. Along with 

 many common things we found the schizopod Gastrosaccus sanchis, not 

 previously known nearer our seas than Jersey. 



III. On January 29, 1898, the Committee had the use of the Lanca- 

 shire sea-fisheries steamer ' John Fell.' Several hauls were taken about 

 7 miles to the west of Fleshwick (Isle of Man), then some further to the 

 south between Port Erin and the Calf. Amongst other species obtained 

 were Gliona celata (fine, in various conditions), Sertularia tenella, and a 

 number of hydroids and polyzoa, Sarcodictyon catenata, Porania 

 pulvillus and Palmipes membranaceus, Inachus dorsettensis, Ascidia venosa 

 and A. virginea, Gapulus hungaricus, Venus casina, and Pectunculus 

 glycimeris. 



TV. On March 11—13 the woi'k was again done from the steamer 

 'John Fell.' On the 11th the steamer left Douglas to examine the shoal 

 lying to the north-east and south of the Bahama light (see chart, Plate 

 IV.). Here, along with various food-fish and some commoner inverte- 

 brates, some very large specimens of Tritonia Hombergi were trawled ; also 

 the ascidians Ascidia virginea, Didemnum gelatinosu'm and Polycyclus 

 Savignyi (very large specimens), Gorystes Gassivelaunus, Scaphander 

 lignarius, Aglaophenia tubulifera, A. myriophyllum, Galycella fastigiata, 

 and Sertularella Gayi, which is a new record to the district ; Eudendrium 

 rameum, Thuiaria articulata, Gonothyrcea gracilis and other zoophytes, and 

 various common polyzoa (very abundant and luxuriant). 



On the 13th, after trying again the same shoal as on the 11th, the 

 steamer went to * the top end of the Hole,' 26 miles east of St. Ann's 



1893. M M 



