CRUSTACEANS 



attached to Fucus serratus, covered with Sertul. pumila, Laomedea Geniculata, and L. gelatinosa, 

 Nov. 1 2th, 1 847, hundreds were thrown on the sands, Gwyllyn-vase, Pennance, etc. sulcata, 

 Mont. [Z,. pectinata, Spengler]. On cork, feathers, or sepiae, etc. : not common. I removed 

 several young ones (May, 1849) from the bottom of a vessel from Leghorn (In Col. Montagu's 

 specimens there were only fifteen ribs ; Mr. Couch's, twenty-eight in one and twenty-nine in 

 another ; and in some of mine there are thirty-eight to forty ribs), Gwyllyn-vase, Swanpool, 

 Pennance, Bream bay, etc. 



' Genus Pollicipes. Lamarck. [Leach]. Pollicipes mite!/a, Chenu. [Pollicipes mitella (Linn.)]. 

 From the bottom of the schooner Mary Ann, of Jersey, laden with oil, from Gallipoli, Naples, 

 Jan. 5th, 1850, dead specimens from beach, near custom-house quay. scalpellum. Lam. \Scalpellum 

 vulgar -e, Leach]. Attached to Sertularia polyzonias, S. nigra, Gorgonia verrucosa, etc., deep water, 

 trawl refuse : common. 



' Genus Cineras. Leach. [Concboderma, Olfers]. Cineras Cranchii, Leach. \Concboderma 

 virgata (Spengler), for which C. virgatum should be read]. Bottoms of vessels : not uncommon. 



' Genus Otion. Leach. [Conchoderma, Olfers]. Otton Cuvieri. [Darwin gives Conchoderma 

 aurita (Linn.), for which C. auritum should be read] attached to bottoms of vessels from the Black 

 Sea, Egypt, Leghorn, etc., Custom-house quay, bar sands : not uncommon. 



' Genus Alepas Rang. Alepas parasita, Lesson. [Sander Rang]. Attached to umbrella of the 

 Cyanaea tuberculata, Pennance sands, Aug. 1845. In 1846, two from the bottom of a brig from 

 Odessa, Custom-house quay.' 



From Darwin's own work the following notices may be taken : Concerning Balanus porcatus, 

 da Costa, he says, ' Mr. Jeffreys, who knows this species well, has found it common on the extreme 

 southern shores of England.' * On Bate's authority he reports Alcippe lampas, Hancock, a member of 

 the Lepadidae, from south-eastern shores, off the Eddystone Lighthouse.' 2 In discussing A/epasparasita, 

 he says that it ' has been always taken on Medusae,' and does not reconcile this with the apparent 

 exception of which he had been informed by Mr. Cocks. 3 On the attachment of Scalpellum vulgare 

 Darwin remarks that ' Specimens are attached to various horny corallines, and occasionally to the 

 peduncles of each other,' with a footnote, 'Mr. Peach (Transact. Brit. Assoc. 1845, p. 65) states 

 that this is sometimes the case in Cornwall ; and I have seen a similar instance in a fine group from 

 Naples.' * When dealing with the ' complemental male ' of this species, Darwin acknowledges his 

 great indebtedness ' to Mr. Peach for his unwearied kindness in procuring me fresh specimens.' He 

 had some dozen specimens from Cornwall, on all, or nearly all of which there were these ' parasitic 

 males.' Only on very young specimens they never occur. ' On a Cornish specimen, with a 

 capitulum a little more than one-fifth of an inch in length, it may be mentioned as unusual that 

 there were three males. In young specimens there is generally one male on each scutum, but 

 sometimes there are two, and sometimes none on one side. In large old Cornish specimens I have 

 counted on the two sides together, six, seven, and eight males, and in one Irish specimen no less 

 than ten, seven all close together on one valve, and three on the other, but I do not suppose that 

 these were all alive at the same time.' 6 



In bringing to a close this chapter on the Crustaceans of Cornwall I can imagine the mild spirit 

 of modesty suggesting to the author some apology for its inordinate length. What the subject itself 

 more imperiously demands is quite a different attitude not that I should ask pardon for having 

 written too much, but that I should plead the sense of moderation as my only warrant and excuse for 

 having explained too little. Borlase compared the form of the county to a cornucopia. It has 

 proved to be indeed a cornucopia in regard to its crustaceans, and, while that is true of those 

 already known, there can be no doubt that before long the ' horn of plenty ' will be found to contain 

 many more species than as yet it has yielded to science. 



1 Balanidae, p. 258. 



1 Ibid. p. 530. The name Alcippe being preoccupied, Norman in Ann. Nat. Hist. (1903), Ser. 7, 

 vol. xi, p. 369, substitutes Trypetesa. 



3 Lepadidae, pp. 159, footnote, 164. ' Ibid. p. 226. * Ibid. 240. 



289 37 



