Head, Nantucket, and their Fossils. ip 



CRUSTACEA. 



*BALANUS CRENATUS Briig. (Verrill, 1875, p. 373). 

 Common in the lower shell bed No. 1, usually with the parts of 

 the shell separated. 



*BALANUS PORCATUS DaCosta. (Verrill, 1875, p. 374). Plate 

 III, figure 6. 



Found in beds 1, 3 and 4. The specimens from the upper shell 

 bed No. 3, are exceptionally large. So far as seen the parts are 

 always separated. 



*BALANUS EBURNEUS Gould. (Verrill, 1875, p. 373). 

 Entire specimens of this species are common attached to Ostrea 

 and other shells. 



*BALANUS IMPROVISUS Darwin. 



Certain of the smaller barnacles seem to belong to this species. 



The opercular valves are like those figured and described by 



Darwin for this species. They were from the lower shell bed No. 1. 



*NEOPANOPE TEXANA SAYI Smith. (Cushman, 1905, p. 195). 

 Plate III, figure 7. 



The claws of this species are fairly common. They probably 

 belong to bed No. 1. 



*EUPANOPEUS HERBSTII Milne Edwards. (Cushman, 1905, 

 p. 195). Plate III, figure 8. 



A single claw of this crab was found, associated with the 

 preceding. 



*CALLINECTES SAPIDUS Rathbun. (Wilson, 1905, p. 990). Plate 

 III figure 9. 



A single claw of this species was found with the others. 



PAGURUS POLLICARIS Say. (Desor and Cabot, 1849, p. 342). 



The original record of Desor and Cabot is the only one for the 

 species. Their specimens may have belonged to one of the above 

 species may have been wrongly identified. 



