GENUS VERRUCA. 51 I 



spread over the basal membrane, at the bottom of the 

 sack • hence they in fact lie almost on one side of the 

 animal : they consist of two main trunks, proceeding out of 

 the animal's body at the rostral end of the sack, which then 

 branch and inosculate. In specimens of V. Stromia col- 

 lected by Mr. Peach for me, in Cornwall, during the first 

 week of April, there were included two ovigerous lamellae, 

 placed transversely across the rostral and the carinal end 

 of the sack: the lamellae were *11 of an inch in length; 

 they appeared loose and not attached, as in the Lepadidse, 

 to any ovigerous fraena. The ova, in their earliest age, 

 have one end much pointed, and are ^ths of an inch in 

 length ; they become blunter and increase a little in size 

 before the larvae burst forth. The larvae, both during their 

 earliest stage and after the first moult, have been excel- 

 lently figured and described* by Mr. C. Spence Bate : they 

 present no particular characters distinct from the larvae of 

 other Cirripedes. I will only further add, that the struc- 

 ture of the prehensile antennae still adherent to the basal 

 membrane, indicates that the larva in its last stage, — that 

 is the locomotive pupa, — has a normal character. 



Affinities. — These have been sufficiently discussed under 

 the family ; I need here only remark that all the species, 

 with the exception of V. neoca, are intimately allied together. 



Mange — Habits — Geological History. — The genus 

 Verruca ranges, being represented by four species, from 

 Iceland to Cape Horn. The species that is found in Tierra 

 del Fuego extends up the west coast to Peru. Our northern 

 form, V. Stroma, (if I may trust a specimen in the British 

 Museum, apparently ticketed in an authentic manner), oc- 

 curs also in the Red Sea ; and this is the only locality in the 

 eastern hemisphere whence I have seen this genus. The 

 species seem generally to live in rather deep water : I pro- 

 cured V. Icevigata from nineteen fathoms, on the east coast 

 of Patagonia : V. Stromia is found, according to information 

 given me by Professor Forbes, on the British shores, 

 between five and fifty fathoms, and on the steep shore off 

 Mull, in ninety fathoms ; but Mr. Thompson assures me 



* 'Annals and Mag. of Nat. Hist./ 1851, PI. 7, fig. 8—10. 



