Clare Island Survey — Marine Mollusca. 22 25 



Acanthodoris pilosa (Muller). {Doris.) W. Rare ? One specimen was taken 

 in Clare Island harbour in April, 1909 (J. B. Butler). 



Laniellidoris bilamellata (Linne). (Boris.) E. Three specimens were found 

 under stones at low water, Inishimmel, May, 1910. 



Goniodoris nodosa (Montagu). W. E. Frequent : 4 specimens dredged in 

 5 f. off the harbour, Clare Island, 1 taken at low water near Portlea 

 (G. P. Farran), 1 at low water, Annagh Island (Miss J. Stephens), and 

 4 at low water at the south-west end of Curraun Achill. 



Thecacera pennigera (Montagu). W. Rare. On the 24th July, 1910, while 

 examining in the laboratory, Clare Island, a basin full of red sea- 



* weed (Plocamium), part of the material dredged the clay before by 

 Mr. Praeger and myself from a depth of 5 f. off Granuaile's Castle, I had 

 the good fortune to detect a single specimen of this rare species. Though 

 hardly -]■ inch long, the vivid orange and black colouring of the animal 

 immediately betrayed it as it emerged from the weed and crawled up 

 the side of the basin. Comparison on the spot with the description and 

 the admirable plate in Alder and Hancock's Monograph, placed beyond 

 question the identity of the specimen with Thecacera yennigera. In 

 addition to the large clavate processes behind the branchiae, the Clare 

 Island specimen, preserved in spirit, showed directly in front of the 

 branchke a semicircle of 8 small bead-like tubercles, a feature not 

 mentioned by Alder and Hancock, and not apparent in the living 

 animal. 



Class SCAPHOPODA. 



Dentalium vulgare Da Costa. (D. tarentinwm.) W. M. E. Frequent : taken 

 in 8 hauls, 5-19 f., a total of 23 living specimens, 40 perfect, and 

 12 broken shells, the largest 38 mm. long. In one haul in 5 f. off the 

 harbour, Clare Island, 10 living specimens were taken. 



D. entalis Linne. M. Pare : a total of 7 living specimens taken in the bay, 

 1 in 11 f., 3 in 13 f., 1 in 18 f., and 2 in 19 f., the largest 40 mm. long. 

 The relative frequency of the two species of Dentalium in the Clew Bay 

 area is precisely the reverse of what obtains in the Dublin marine area, 

 where D. vulgare is quite rare. 



Class PELECYPODA. 



Order PROTOBRANCHIATA. 



Nucula nucleus (Linne). W. M. E. Abundant, living, and of large size, 

 on muddy bottoms in shallow water, 2-5 f. in the eastern parts of the 

 area; valves frequent off the island and in the bay, 5-19 f. Living 

 specimens dredged off Inishlyre measured 13 mm. x 11 mm. 

 K.I. A. pkoc, vol. xxxi. D 22 



