\\i-2 THE VOYAGE OF H.M.S. CHALLENGER. 



bluntly truncated, and bears small and numerous short spines or teeth. The maxilla 

 (PL XI. fig. 4) have a simple edge with numerous spines; a very small notch is visible a 

 little behind the middle. The upper spine is large, much larger than the second one. The 

 part above the notch forms a distinct projection over the lower part. Second maxilla 

 only slightly developed, covered almost over its whole surface with numerous slender hairs. 



Cirri. — First pair short, with unequal rami ; the longest ramus has seven, the shortest 

 five segments. The other cirri in the specimen I have dissected have at least one of 

 the rami truncated, and the truncated extremity swollen in a curious way ; it looks 

 almost as if each ramus was furnished at its extremity with a number of globular vesicles. 



Caudal appendages rudimentary, of one segment only. 



The specimens are attached to a Sclerodermous Zoantharian (Flabellum '?) 



A small complemental male is present at both sides, attached near the occludent margin 

 of the scutum. It has a length of - 88 mm., and shows a well-developed testis with a 

 receptaculum seminis. At the anterior extremity it is furnished with well-developed 

 antennae; at the other extremity a circular space is to be distinguished, enclosed by a 

 thickening of the chitinous wall of the body. 



Among the eggs, which entirely fill the cavity of the capitulum, I observed a larva in 

 the Cypris-stage. The ova were fecundated, and happened to be in one of the later 

 cleavage-stages. 



This species was taken at Station 320, February 14, 1876; lat. 37° L7' S., long. 

 53° 52' W. ; depth, 600 fathoms ; bottom temperature, 2° - 7 C. ; bottom, hard ground. 



Verruca, Schumacher, 1817. 



The genus Verruca comprises those Cirripedia which are not furnished with a peduncle, 

 which have scuta and terga without depressor muscles, movable only on one side, on the 

 other side united immovably with the rostrum and carina into an asymmetrical shell. 



This genus is the only representative of a whole family of Cirripedia, which, according 

 to Darwin, has affinities equally divided between the two great Families of Balanida? and 

 Lepadidse ; it differs from all the other genera " in the extraordinary unequal development of 

 the two sides of the shell." Darwin gives a very extensive description of the genus and of 

 the different species known to him. Though the Challenger brought together specimens 

 of six different and new species of this genus, I have not been able to add so much to our 

 knowledge of the genus as I should have wished, except as far as regards its geographical and 

 bathymetrical distribution. All the species are relatively small, and most of them arc 

 represented by one or two specimens only. 



Darwin describes four recent species of this genus : Verruca stromia, 0. F. Miiller, sp., 

 which inhabits the shores of northern Europe, and which is found fossil also in 

 Glacial deposits of Scotland, &c, &c. ; Verruca laevigata, G. B. Sowerby, extending from 



