Zoological Society. 65 



the Capros Aper, La Cep., Zeus Aper, Linn., a Mediterranean species 

 which has not before been noticed as occurring on our shores, un- 

 less it be the fish included by Mr. Couch in his list of the Fishes 

 found in Cornwall, (Linn. Trans., vol. xiv. p. 81.) under the name 

 of Stone Basse ; the reference to Ray, however, made by the latter 

 author is to a species of Gerres, Cuv. Dr. Boase's drawing agrees 

 well with the figure published by Rondelet. 



The other drawing represents a Tetrodon, evidently identical with 

 that obtained from the same coast by Pennant and by Mr. Donovan. 



Mr. Gray gave some account of the reproduction of Cirrhipeda, 

 founded on observations made by him on Balanus Cranchii, Leach, 

 during a recent visit to the coast of Devonshire. In illustration of 

 his remarks he exhibited an adult of that species with the eggs at- 

 tached to the body at the base of the shell, and the young in ovo. 

 He also exhibited numerous very minute individuals of Bal. vulgaris 

 affixed to rock. 



He described the mode of reproduction as ovoviviparous. On 

 opening under water, after they had been preserved in spirit, the 

 eggs attached to the body of the adult, each was found to contain 

 a perfectly developed animal, which occupied nearly the whole of 

 its cavitj'. The form of the young Barnacle at this period of its 

 existence is ovate, rather tapering above, and truncated and ciliated 

 at the tip : it is furnished with three pairs of arms along the sides, 

 the base of each arm being two-jointed ; the lower pair of arms has 

 only one elongated process, while each of the two upper pairs has 

 two fusiform, thick, articulated and ciliated processes, similar to 

 those of the anterior part of the perfect animal, but less elongated. 

 From the adult it differs chiefly in having a smaller number of feet 

 and in the less development of the hinder part. It is also destitute 

 of shelly covering, which is probably not formed until the young 

 animal becomes fixed. In very small attached individuals of the 

 common Barnacle the shell is rather soft, transparent and horn-co- 

 loured. 



In the absence of shell from the animal in the egg, an additional 

 evidence is furnished of the affinity of the Cirrhipedes to Crustacea 

 rather than to Mollusca : the foetus in the latter class being covered 

 by a shell at a very early stage of its embryo growth. The existence 

 in the young animal of a smaller number of arms than that found 

 in the adult is also analogous to the corresponding fact which has 

 been observed in several of the Branchiopodous Crustacea. A simi- 

 lar fact has recently been noticed by Dr. Nordmann as occurring in 

 Lerncea. 



Mr. Gray remarked that he had been the more induced to call 

 the attention of the Society to the subjects which he exhibited, on 

 account of his observations being at variance with those recorded 

 by Mr. J. V. Thompson in the fourth Memoir of his 'Zoological 

 Researches.' The young of Balanus is there described as being, 

 when -,'ffth of an inch in length, a free swimming animal, resembling 

 Cyclops in its general form, and having pedunculated eyes: and it is 

 stated that it then throws off its bivalve-shell-like envelope together 



Third Scries. Vol.4. No. 19. Jan. 1834. K 



