THE CIRRIPEDIA COLLECTED NEAR PORTO RICO BY THE FISH HAWK 
EXPEDITION IN 1898-99. 
By MAURICE A. BIGELOW, 
Instructor in Biology , Teachers' College , Columbia University. 
The collection of Cirripedia is small, both in number of genera and species rep- 
resented and in individuals. Of ten small jars holding the collection, four contain 
but a single specimen each, live have from two to four specimens, and only one 
( Lithotrya ) furnished abundant material for comparison and dissection, which are so 
important in identification of species in such a variable group. Owing to the small 
amount of material, some of the identifications are very uncertain as regards the 
species. All of the specimens are identified as belonging to well-known genera, which 
have been heretofore reported from the West Indies. 
A glance at the list that follows shows that each of the families of Cirripedia, 
Lepadidoz and Balanidce , is represented by two genera. In the case of the former 
there are two species, while the latter family is represented by possibly four species. 
No Cirripedia which live at the surface of the water were in the collection. Since 
no new species are recorded, it seems quite unnecessary to insert in the report diag- 
nostic descriptions of the few forms listed, but references have been given to the 
important literature used in identification of the specimens. 
Family LEPADIDA. 
Scalpellum (species?). 
A single specimen, apparently young, was taken at stations 6062-6063 in Mayaguez Harbor, at a 
depth between 25 and 75 fathoms. The specimen closely corresponds with Hoek’s description (Chal- 
lenger Reports ) and figure of Scalpellum pedunculatum, but differs from his description {frincipally in 
that the capitulum and peduncle in this specimen is not “clothed with numerous spines,” as Hoek 
characterized the covering membrane in this species. The velvet-like membrane seen on the specimen 
under discussion is more in accord with Hoek’s description of S. vclutinum. In most other characters 
it is not easy to distinguish the two species as described by Hoek, and since each was based upon a 
single specimen collected by the Challenger there is possibility that variation may be so great as to 
invalidate the distinction between the species. It seems wisest not to attempt a definite assignment of 
the specimen to a species until others are obtained. 
(Darwin, Monograph of the Cirripedia; Challenger Report on Cirripedia, by Hoek.) 
Lithotrya dorsalis Sowerby. 
Numerous specimens were taken at Ensenada Honda, Culebra, and a few off Aguadilla. The 
animal bores in coral and limestone rock, pieces of which were attached to some of the specimens. 
(Darwin, Monograph of Cirripedia.) 
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