326 BULLETIN 93, UNITED STATES NATIONAL MUSEUM. 



The general proportions of the cirri may be seen in the photograph 

 (pi. 76, figs. 1, la). 



Cirrus i has extremely short, conic rami of 10 and 8 segments. 



Cirrus ii has very unequal rami, of 10 and 17 segments, the anterior 

 ramus not two-thirds the length of the posterior, covered with fine 

 spines. The posterior ramus has long spines on the anterior edge, 

 similar to those of cirri iii-vi four spines on the lower, three on 

 the intermediate, and two on the distal segments. 



Cirrus iii has rami of 19 segments. Segments of the distal half 

 have three main pairs of spines, the rest having four pairs. There 

 are dense groups of short spines on the anterior side, as in subse- 

 quent cirri. 



Cirrus iv has rami of 23 and 25 segments, spines as in cirrus iii. 

 Cirrus v is similar. 



Cirrus vi has rami of 26 segments, with four pairs of spines (fig. 

 97<? ) on the lower half, three pairs on the segments of the distal part. 

 As in the other cirri, there are bunches of short spines between the 

 insertions of the paired spines. 



The penis (pi. 76, fig. la) is short for a ChthamaLus scarcely 

 as long as the sixth cirri. It is very densely annulated, and from this 

 I presume that it is capable of considerable lengthening. The ex- 

 tremity is emarginate, with a dense patch of short hairs on one side 

 near the end (fig. 97e). 



This species is readily known by the size gigantic for a GMha- 

 malus by the solidity of all the parts, and the serrate sutures, when 

 these are not obscured by corrosion. The cirri and mouth-parts are 

 equally characteristic, especially the second pair of cirri, in which 

 the posterior branch is like the third and later cirri. There are more 

 short bristles between the pairs of spines on the cirri than in any 

 other species. The maxilla has more numerous spines than in other 

 species. 



The articulating face of the scutum is very broad, being greatly 

 foreshortened in figure 2a. The equally broad opposed face of the 

 tergum is well shown in figure 2. 



The specimen from Maui consists of the body, the scuta, and one 

 tergum. It was probably obtained by a landing party, reported at 

 that station. 1 The valves are very deeply corroded, livid pink and 

 white externally. Length of scutum, 33 mm. 



The type-specimen of C. hembcli seems to be lost, or at all events 

 I have not found it in the collection of the Academy of Natural 

 Sciences. The locality was given by Conrad, on Thomas Nuttall's 

 authority, as " near Sta. Diego." This seems to be incorrect, not 

 only in the gender of the saint, but also in the habitat of the barnacle. 



1 Rcp. U. S. Fish Commissioner for 1902, p. 408. 



