PLATE XXXVII. 



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Figs. 1-5. Hijpohythhis cahjcodes, Moseley. 

 Figs. 6-9. Hypobythius moseleyi, n. sp. 



Fig. 1. Hypobythius cahjcodes, seen from the ventral surface, and showing the body and 

 peduncle, the cartilaginous thickenings of the test (t.t.), the branchial (br.) 

 and atrial (at.) apertures, and most of the internal organs ; half the natural 

 size. (From a drawing by Professor H. N. Moseley.) 



Fig. 2. Outline of the dorsal side of the body of Hypobythius caly codes, to show the 

 atrial aperture (at.), and the symmetrical arrangement of the nodules of 

 thickened test (t.t.) ; much reduced. (From a drawing by Professor H. N. 

 Moseley.) 



Fig. 3. A small portion of the mantle of the same species, to show the arrangement of 

 the muscle bands (m.b.) ; magnified (Hartn., obj. 4). 



Fig. 4. Part of the branchial sac of Hypobythius calycodes, showing the rounded stigmata 

 (sg.) formed by the irregular vessels (ti\) ; magnified (Hartn., obj. 4). 



Fig. 5. Two spermatozoa (one seen sideways) of Hypobyth his cahjcodes; much magnified. 

 (From a drawing by Professor H. N. Moseley.) 



Fig. 6. Outline of the body of Hypobythius moseleyi; about the natural size. 



Fig. 7. The dorsal part of the branchial sac of Hypobythius moseleyi, showing the stig- 

 mata (sg.), and the dorsal lamina (d.l.) ; magnified (Hartn., obj. 5). 



Fig. 8. The dorsal region of the anterior end of the branchial sac of Hypobythius moseleyi ', 

 showing the dorsal tubercle (d.t.), the nerve ganglion (n.g.), the neural 

 gland (n.gl.) the peripharyngeal bands (p-P-), and the commencement of 

 the dorsal lamina (d.l.) ; much magnified (Hartn., obj. 5). 



Fig. 9. Part of the mantle of Hypobythius moseleyi, showing the arrangement of the 

 muscle bands (rn.b.) ; magnified (Hartn., obj. 4). 



