Barnacles of the Genus Scalpellum. 121 



and figures of Annandale, but the largest is only about two- 

 thirds of the size shown by his figure (no measurements are 

 recorded in the text) . Further, the surface of the capitulum, 

 instead of being glabrous, is covered with a very short and 

 fine velvety pubescence with longer hairs scattered at 

 intervals. The largest specimen shows an inflation of the 

 capitulum like that described above in S. alcockianum. The 

 angular projection of the peduncular scales is very prominent 

 and characteristic. 



The cirri are light-coloured. The caudal appendages are 

 about twice as long as the peduncle of the sixth cirrus and 

 have 13 to 16 segments. No males were found. 



Scalpellum (Scalpellum) portoricanum, Pilsbry. 



Scalpellum portoricanum, Tilsbry, Bull. U.S. Nat. Mus. Ix. 1907, p. 35, 

 text-fig. 8. 



Locality— -Lat. 18° 31' N., long. 66° 19' W. (Off Porto 

 Rico), 180fath. C./S. ' Henry Holmes/ 2 S . 



Remarks. — The two specimens differ from the description 

 of the typical S. portoricanum in having the cuticle covered 

 with a close but very short velvety pile (the subspecies 

 intonsum is said to be " rather densely hairy "). The valves 

 are all in contact, as in the figure of the subspecies. The 

 marginal ridges of the carina are obsolescent and the area 

 between them slightly convex ; the base of the carina is 

 angled. The carinal latera do not spread outwards quite so 

 much as in the figures. The rostral latus approaches closely 

 the proportions of that figured for the typical form. The 

 inframedian latus is wider at the base than it is high, but 

 shows the characteristic curvature of the apex towards the 

 scutum. The peduncle is as long as the capitulum. The 

 peduncular plates of the larger specimen are more trans- 

 versely elongated than in tiie figure of the type and not 

 close-set and overlapping as in that of the subspecies. 

 There are seven longitudinal rows of about eleven plates in 

 the larger specimen. The capitular valves show traces of a 

 reddish colouring arranged in bands following the lines of 

 growth. 



Although the larger of our two specimens is more than 

 twice the size of the holotype, the agreement in all characters 

 except those mentioned above appears close enough to 

 warrant its identification with this species. 



No account of the appendages is given by Pilsbry. The 



