386 EXPLANATION OF THE PLATES. 



Fi S; 



\d\ Scalpellmn omatum. An imaginary section through the 



cavity {x) in which the male is 



lodged. 

 (a.) Section of the shell of the 



scutum of the female. 

 (b.) A layer of chitine homologous 



with the shell, and partially 



lining the scutum. 

 (c.) The inner lining (of chitine) 



of the sack of the female. 

 (d.) A double fold of corium. 



2. Scaljjellum rutilum, (magnified two and a half times). 

 2d. ,, „ Internal view of scutum, enlarged. 



(a.) Depression for the adductor 



muscle. 

 (3.) Cavity for the reception of the 

 male. 

 2b' . ,, „ External view of carina. 



2c '. „ „ Section across middle of carina. 



3. Complement al Male of Scalpellum Peronii, greatly 



magnified. 



4. Complemental Male of Scalvellum villosum, greatly 



magnified. 

 (d.) Natural size. 

 4,#, b, c. Ditto, valves separated. 

 (a.) Scutum. 

 (b.) Tergum. 

 (c.) Carina. 



5. Complemental Male of Scalpellum rostratum, a re- 



stored figure, greatly magnified. Scutum and 

 rudimentary carina correct. 



0. JScalpellum Peronii, one and a half the natural 

 size. 

 (a.) Rostrum a little more enlarged, front view of. 



7, Scalpellum rostratum, magnified six times. 

 (a.) Rostrum, front view of. 



