TRANSACTIONS OF THE SECTIONS. 93 



on the Anglesea side of the Menai. The writer picked up also dead shells of Ernar- 

 yinula reticulata, and obtained a specimen of a rare fish, Echiodon, By means of 

 the dredge, he got from Llandudno Bay Tuhularia indivisa, Bullea aperta, Ophiura 

 rosula, Beroe pileus. Medusa aurita, and a few other species of animals. The deep 

 cavernous inlets at the foot of the Ormshead, appear to abound in other Medusidse, 

 which however we cannot attempt to enumerate. In a little pool in the Bay we 

 captured two specimens of the beautiful little fish, the Argentine. The large 

 yellowish Doris was common in the crevices of the rocks, and we found it also at 

 Beaumaris. It appears to take the place of D. verrucosa, which we have commonly 

 found on the Sussex coast. We picked living specimens of Sphenia Binghami, and, 

 amongst Radiata, Cribella oculata, of a very rich orange colour, Uraster violacea, and 

 Asterins papposa ; also Actinia mesemhryanthemum of distinct varieties or species, the 

 beautiful A. dianthus (finer, however, at Penmon), and Anthea cereus. Saxicava 

 ruyosa seems to take the place of the Pholades as a borer in the limestone, though 

 valves of P. Candida and crispata are to be found. The Cephalopoda generally seem 

 rare on the coast of North Wales ; Sepia, Loligo vulgaris and media, all of which we 

 have found plentiful on the Sussex coast, are uncommon, particularly the first ; 

 Sepiola and Octopus are, we have heard, occasionally found ; of the ova of Cepha- 

 lopoda we found none. Trochus magus, crassus, and zizyphinus are very fine on the 

 Caernarvonshire coast ; the largest of the first species are carried up by sea-birds to 

 the summit of the rocks, the second is the most common species of the shores. 

 Patella pellucida in all its forms is found on the Laminaria. We got tvvo fresh 

 shells of Turnatella from the Menai, anfl one of Rostellaria pes-carhonis. Fusus 

 antiquus and islandicus. Bulla lignaria and the large Turriiella are not rare as 

 mere shells. The Natica moniliformis, as it is now termed, abounds alive in Car- 

 digan Bay, but smaller than on our southern coast. Pecten maximus and Donax 

 trunculus or anatinus are also often small. The different species of Venns seem to 

 abound in this sea, particularly if we extend our search to the Isle of Man, where 

 we found V. striatula and casina. Tapes aurea and fasciata, Artemis lincta, horealls 

 and exoleta, and Fenerupis pullastra, decussata and virginea, often containing the 

 animals. Solen ensis, Reliqua marginatus and legumen are also common and fine on 

 this coast ; and other not rare bivalves are Lutraria ellipiica, Scrobicularia piperita, 

 Mya truncata, Psammobia Ferroensis, Mactra solida, truncate, subtruncata, and 

 stultorum, the latter, however, often as cinerea ; also Pectunculus glycimeris in its 

 two principal varieties. 



Crustacea appear to abound ; we found species of the hermit crab in shells of 

 Trochus, Natica, Turbo, and Buccinum. The latter on the Sussex coast, at the 

 back part of the spire, in company with the crustacean, often contains great speci- 

 mens of the Nereis bilineata ; we have not been able to find it in Wales. The 

 Phyllodice viridis, a pretty green worm, is seen crawling on the wet rocks of the 

 Ormshead ; also a species of Aphrodite or Halithea, about an inch and a half long, 

 with blackish dorsal laminae, four tentacles, muscular retractile proboscis, two sets 

 of bright setae on each side of every joint, the latter being between thirty and forty 

 in number, also a small soft process above and below the setae. The Aphrodite 

 aculeata I could not meet with. 



A specimen of Sponge (S. pulchella) accompanied the communication, which is 

 abundantly thrown up on the Caernarvonshire coast; also some specimens of pearls, 

 and a small shell of the Unio which produces the fine variety. 



On the Morphological Constitution of Limbs. 

 Bij Professor Goodsir, F.R.S.L. 8^ E. 



On the Morphological Constitution of the Skeleton of the Vertebrate Head. 

 By Professor Goodsir, F.R.S.L. 8f E. 



On the Morphological Relations of the Nervous System in the Annulose anc 

 Vertebrate Types of Organization. By Professor Goodsir, F.R.S.L. 8i E. 



