. Bulletin of the Natural History Museum Zoology. DEEP-SEA PROTOBRANCHIA (BIVALVIA) 41 tulous space below umbo, anterior plate follows curvature of antero-dorsal margin, posterior plate with slight convex arch, equal number of teeth on each plate, teeth with prominent dorsal arm and reduced ventral arm. Prodissoconch length: c 170 Maximum recorded shell length: mm. Shell measurements (mm) & ratios are as follows:- Length Height Width H/L W/L PL/TL Internal morphology (Fig. 60). The siphons are com- bined, with a single l
. Bulletin of the Natural History Museum Zoology. DEEP-SEA PROTOBRANCHIA (BIVALVIA) 41 tulous space below umbo, anterior plate follows curvature of antero-dorsal margin, posterior plate with slight convex arch, equal number of teeth on each plate, teeth with prominent dorsal arm and reduced ventral arm. Prodissoconch length: c 170 Maximum recorded shell length: mm. Shell measurements (mm) & ratios are as follows:- Length Height Width H/L W/L PL/TL Internal morphology (Fig. 60). The siphons are com- bined, with a single lumen present. A siphonal tentacle occurs on the right side of the siphonal embayment. The adductor muscles are unequal in size the anterior being one and a half to two times larger in cross-section than the posterior. Both are more or less oval in shape. The gills are well-developed with 13-16 plates. The labial palps are small in the contracted state, extending about 1/4 distance across body, and have 8-10 moderately narrow palp ridges. In contrast the palp proboscides are well-developed. The pedal ganglia are large and elongate, similarly the visceral and cerebral ganglia are also well-developed. They are club- shaped with the cerebral ganglia being slightly larger than the visceral. The foot is long and narrow, with a large byssal gland in the heel. The stomach is large and there is a single hind gut loop on the right side of the body. Yoldiella inconspicua inconspicua Verrill & Bush 1898 Type locality. Off Martha's Vineyard, 318 fm. Original specimens were taken from North American Basin between Lat. 42°33'N, Long. 69°'W and Lat. 35°'N and 74°'W by the Fish Commission Steamers Fish Hawk and Fig. 60 Yoldiella extensa. Lateral view from the right side of the internal morphology of a specimen from Sta. 245 Argentine Basin. (Scale = mm). For identification of the parts see Fig. 34. Type specimen. Holotype: Natl. Mus. No. 48867. Yo
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