1894. PROCEEDINGS OF THE NATIONAL MUSEUM. 731 



Plate xxiv. 



Fig. 1. Siiergo glandiniformis, Dall; diagrams, a, h, d, natural size; e, slightly 

 enlarged ; /, about twice natural size ; h, much magnified ; a, front view of muzzle, 

 showing relaMve position of tentacle; h, side view of animal crawling ; d, front 

 edge of foot from below; e, verge as it lies on the back of the animal with the 

 point turned away from the head ; h, teeth, the upper pair are placed in the 

 natural position as they appear on the radula; the base of the tooth is shaded 

 with dots ; outside of it is a narrow fibrous band by which the teeth are attached 

 to the radula; the blades are unshaded; from camera lucida sketches by W. H. 

 Dall; page 680. 



Fig. 2. Spergo glandiniformis, Dall, shell, alt. 46 mm.; page 680. 



Fig. 3. Ualicardia Jicxuosa, Veki;ill, slightly enlarged; diagram of the soft parts as 

 removed from the shell, showing the siphonal extreme of the body; i, end of 

 the left branch of the retractor of the foot; d, left end of the posterior adductor 

 muscle. Drawn by W. H. Dall; page 697. 



Fig. 4. Euciroa 2)acifica,'D ALU about natural size; diagram of the soft parts removed 

 from the valves; a', right end of anterior adductor muscle with e above it, 

 being the end of the right branch of the jirotractor of the foot; c, area shaded 

 to show the genital gland or ovary as seen through the mantle ; m, surface of 

 the area occupied by columnar muscular tissue between the surfaces of the 

 mantle; </-^, extent of pedal opening between the mantle lobes; a, posterior 

 adductor with below it at the mantle-edge the short siphonal retractor muscles. 

 Drawn by W. H. Dall; page 688. 



F\g.5..Euciroa pacifica, Dall, much enlarged, diagram of the palpi and lappet; a, 

 the double sacs above jj, the anterior palpi; I, the fieshy median lappet; p, 

 the posterior palp, folded on itself. Drawn by W. H. Dall ; page 692. 



Fig. 6. Frieleia lialli, Dall; view of the valves from the side, alt. 20 mm. ; page 714. 



Fig. 7. Enciroa pacifica, Dall, uniboual view of valves; page 688. 



Fig. 8. Euciroa pacifica, Dxll; side view; Ion. 28 mm. ; page 688. 



Fig. 9. Frieleia halli, Dall; basal view of brachial valve, showing crura, buttresses, 

 and septum in profile; page 714. 



Fig. 10. Frieleia halli, D.\ll; basal view of pedicle valve, showing buttresses; page 

 714. 



Fig. 11. Frieleia halli, Dall; interior of pedicle valve; alt. 20 ram.; page 714. 



Fig. 12. Frieleia halli, Dall, enlarged view of cardinal region of brachial valve, 

 showing crura, spoudylium, and septum; page 714. 



Fig. 13. Frieleia halli, Dall, view of ha-mal side; alt. 20 mm, ; page 714. 



Plate xxv. 



Fig. 1. Solemya johnsoni, Dall; longest dimension of the sjjecimen figured, 115 mm. 



See page 712. 

 Fig. 2. Lyonsiella alaskana, Dall ; 24 mm. ; page 703. 

 Fig. 3. Hmopsi8 vaginatus, Dall, internal view of a right valve with the pilose 



epidermis removed by potash to show the inflected posterior margin; 25 mm.; 



page 713. 

 Fig. 4. Cahjptogena pacifica, Dall, interior of right valve; 48 mm. ; page 713. 

 Fig. 5. Cahjptogena pacifica, Dall, exterior of the same valve; 48 mm.; page 713. 

 Fig. 6. Limopsis vaginatus, Dall, internal view of left valve retaining the pilose 



epidermis; 34 mm. ; page 713. 

 Fig. 7. Liino2)sis vaginatus, Dall, external view of left valve; 34 mm.; page 713. 



Plate xxvi. 



Fig. 1. Dentalium phanemn, Dall; 35 mm.; page 686. 



Fig. 2. Cryptodon hisectus (Conkad), Dall; side view; .50 ram. ; page 713. 



Fig. 3. Dentalium complexum, Dall; 78 una.; page 680. 



