. Bulletin - United States National Museum. Science. 102 BULLETIN 100, UNITED STATES NATIONAL MUSEUM. agree and none correspond to StreifTs description in the character of the oral musculature. StreifTs work on other species is so vcry accurate that one can not think his observations so erroneous upon this form. His account, as it stands, does not agree with conditions in. Fig. 90.—Iasis zonaria, solitary form, seen from the right sidk. The mantle is shrunken atvat from the test on both dorsal and ventral surfaces. x \\ diameters. (drawn by hoyt s. Hopkins.) my specimens, but his accurac
. Bulletin - United States National Museum. Science. 102 BULLETIN 100, UNITED STATES NATIONAL MUSEUM. agree and none correspond to StreifTs description in the character of the oral musculature. StreifTs work on other species is so vcry accurate that one can not think his observations so erroneous upon this form. His account, as it stands, does not agree with conditions in. Fig. 90.—Iasis zonaria, solitary form, seen from the right sidk. The mantle is shrunken atvat from the test on both dorsal and ventral surfaces. x \\ diameters. (drawn by hoyt s. Hopkins.) my specimens, but his accuracy as an observer must not be impugned. There is some confusion here. May it be that Streiff had specimens of Herdmann's "Salpa nitida," and this form thus proves a distinct subspecies ? The body muscles of StreifTs specimens were much broader than those Herdmann figures. There is a single strong sphincter muscle in each lip (fig. 91). At the angles of the mouth their ends are united and run back a short way together, forming an oral retractor muscle. These sphincter muscles lie at the edges of the strongly inturned xips (fig. 92). Each is inter- rupted on the mid line. Fur- ther forward on the oral si- phon, and separated by a considerable interval from the tiui1 sphincters, there is, on each side, a muscle (xx) of dif- FlG. 91.—IASIS ZONARIA, SOLITARY FORM, DORSAL VIEW OF ... anterior end of body, x 3j diameters. (Drawn ferent histological appearance, by hoyt s. Hopkins.) opaque and browner in speci- mens preserved in either alcohol or formalin. These lie at the lateral angles of the flattened oral siphon and extend but a short distance onto the flat dorsal and ventral surfaces of the oral siphon. In a few of my older specimens, neither the largest nor the smallest, the muscle is interrupted at the angle of the siphon, making two half muscles instead of one continuous one. The second sphincter muscle. Please note that these images are extracted from scanned page
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