EXPLANATION OF PLATES 
PLATE 8 
Thalassema philosiracum, new species 
1, A seta, 2.75 mm. long, X 20, and its hook further enlarged. 
2, Dissection of anterior region of type, X 15. The fore-gut has been pulled to 
the right to display underlying structures. In the natural position the 
gizzard is on the left and ventral. Most of the radiating seta muscles have 
been omitted along with the mesenteries except the ventral (VM), which 
is double. 
3, Sketches of four specimens to show variation in body and proboscis length 
due to accidents of fixation. 
B', dorsal blood vessel; B?, ring vessel; B?, neurointestinal connective; B, ventral 
vessel; C, stomach; CG, ciliated groove; G, gizzard; MI, interbasal muscle; 
N, nephridia; NC, nerve cord; O, esophagus; P, pharynx; Pr, proboscis; 
S, seta; Si1, beginning of siphon; VM, ventral mesentery of pharynx. 
PLATE 9 
Thalassema harimani, new species: Type 
1, Portion of alimentary canal to show extent of intestine (dotted) anterior to 
beginning of siphon, X 2. AV, anal vesicle; CG, beginning of ciliated 
groove. 
2, Dissection of anterior end to show relations of. organs. The fore-gut has 
been drawn to the right of natural position; X 10. M, M!‘, mesenteries. 
, Aseta, X 10, and its hook enlarged. 
, Small portion of skin, X 20 to show the papillae bent toward anterior end. 
» Ventral aspect of whole animal, X 2, with only a few papillae indicated. The 
dotted line indicates nerve cord visible through body wall. 
ore CO 
Other lettering as for plate 8. 
Puate 10 
Stpunculus polymyotus, new species 
1, Anterior region of type, introvert retracted, opened a little to left of mid- 
dorsal line and spread out, so that the dorsal retractors are unnaturally 
divaricate and the rectum is on extreme right instead of being in middorsal 
line. The intestinal coil is to the right of its natural position; right neph- 
ridium omitted. Natural size. 
2, Brain and cerebral body (Fr), X 5. 
3, Left side of head region, showing the left paraneural muscle and its exten- 
sions, X 1. The left ventral retractor has a section clipped out; the nerve 
cord is dotted; longitudinal muscle bundles indicated on the left. 
C, Intestinal eoecum; CG, ciliated groove, which, to avoid confusion, has not 
been indicated on the intestine; CV, dorsal contractile vessel of esophagus; 
Fr, cerebral organ or frons; J, introvert; N, left nephridium (right omit- 
ted). NC, nerve cord; O, esophagus; O’, end of esophagus; R, rectum, 
extending to C; the feathered arrows indicate ascending spiral of intes- 
tine; RD, dorsal retractor; RV, ventral retractor; W, fan muscle of 
rectum; X, anterior bend of the forward loop of intestine; Y, the begin- 
ning of anterior loop, indicated by featherless arrows; 7%, the so-called 
anal giands. 
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