274 MOLLUSCA. 



Alder) of this species, were obtained at Glandore Bay, County of Cork, 

 by Professor Allman, in the month of August, 1842. Mr. Alder himself 

 procured specimens of D. aspeni, during an excursion with Dr. FaiTan of 

 Dublin to Malahide, on the coast of Dublin. 



Doris pilosa, Mull. 

 The first Irish specimen of this Don's that I have seen was found in 

 Dublin Bay, by Professor Allman, to whom I am indebted for it ; subse- 

 quently two individuals Avere taken by Dr. J. L. Drummond, when di'edg- 

 ing in the month of June in Belfast Bay. 



D. siihlcevis, mihi. 



D. convex, broadly ovate, smooth, basal sheaths to the tentacula, foot 

 broad, branchial filaments 8, long and finely plumose. 



Length of specimen (from spirits) 7 lines ; height equal to about half 

 the length ; breadth 44^ lines ; margin of cloak narrow ; foot of nearly 

 equal breadth throughout ; tentacula long and acuminated. Colour 

 white. 



In being smooth, this species agrees with the D. l<Bvis, Linn,, Mull. Z. D. 

 vol. ii. p. 9, tab. 47, figs. 3 — 5, but differs much in its convexity and in 

 the breadth of the foot, which is represented very narrow in that species. 



Dredged in Belfast Bay by Mr. Hyndman, September, 1835. 



Genus GoNlODOKls. 

 G. elonr/ata, mihi. 



G. elongated, narrow ; a row of jjapilla; on each side the back ; branchial 

 filaments about 10, plumose. 



Length of specimen (from spirits) 3 lines ; breadth 1 line ; height f 

 line ; breadth of body equal throughout. 



This species resembles in form the D. (/racilis and D. pollens of Rapp. 

 Nova Acta, vol. xiii. part 2, p. 522, tab. 27, figs. 9 and 10. 



I obtained this mollusk in June, 1838, between tide-marks, at the island 

 of Lambay, oflf the Dublin coast. 

 G. nodosa, Mont. 



Twelve specimens of G. nodosa occurred on a plant of Fucus resiculosus, 

 dredged in Killery Bay, County of Galway, in July, 1840. Dr. Ball, 

 Professor E. Forbes, G. C. Hjiidman. — W. T. Mr. Alder found the 

 species to be plentiful at Malahide in September last. 



Var. G. — D. Barvicensis, Johnst. 



I have been favoured by Professor Allman with specimens of this Doris, 

 of which he procured about a dozen in Courtmasherry Harbour, in the 

 months of August and September, 1838. They were all found among 

 the roots of Laminar ia dif/itata cast ashore, and, being alive, a minute 

 description of them, as observed in this state, was drawn up by Professor 

 Allman. In all details except the following these individuals agreed 

 with those described by Dr. Johnston in the Annals : — Slightly elevated 

 white tubercles, chiefly disposed in straight lines, appeared on the sides 

 of the body ; 9 branchial leaflets ; in the several specimens examined 

 these do not encircle the vent, but are wanting for the space of I of a 

 circle posteriorly, two hinder leaflets shortest. 



Genus PoLYCERA. 

 P. quadrilineata, Mull. 

 Frontal processes of the mantle 4 ; angles of the foot pi'oduced ; pair of 

 branchial lobes rather small. 



