HEXELASMA 



353 



The opercular valves agree with the type-description. Figures are given here for 

 comparison. 



.Ad) .(g) 



Fig. II. Hexelasma corolliforme. a. Lateral view (carino-rostral diameter lo mm.), b. Left tergum. 

 c. Left scutum, d. Carina, internal view. e. Carino-lateral compartment, internal view. /. Lateral compart- 

 ment, internal view. g. "Rostrum", internal view. 



Fig. 12. Hexelasma corolliforme. a. Labrum and palpus. 

 b. Mandible, c. Maxilla L d. Maxilla IL 



Scutum with a distinct articular ridge, an internal furrow in the upper part 

 of the plate, a pit for the lateral depressor muscle, an indistinctly marked cavity 

 for the adductor muscle, and an internal ridge, mentioned by Hoek, along the 



occludent margin. 



