Son PROCEEDINGS OF THE NATIONAL MUSEUM VOL. 97 
specimens they are larger at ends of body, in others not. Setae of 
largest specimen 2.75 mm. long, the hook relatively small and sharply 
curved. The proboscis technically forms the lower lip of mouth, but 
the thick border is interrupted just ventral to mouth, which is not the 
case in hartmani. There are no localized thickenings of longitudinal 
muscle layer; inner layer very thin, with satiny luster. 
Nephridia 2 pairs, with fan-shaped nephrostome much larger than in 
hartmani. The anal vesicles are slender, about half the length of 
body; ciliated funnels very small. 
The alimentary canal, similar to that of 7. thalassema (Pallas), has 
a long fore-gut, two-thirds of which is taken up by the pharynx-esoph- 
agus. The gizzard, not well defined, is about equal to the stomach in 
length. The dorsal blood vessel branches to form the ring vessel 
exactly at the end of the fore-gut. The succeeding presiphonal por- 
tion of the intestine is much longer than in 7. steinbecki Fisher (Gulf 
of California to Ecuador), as is also the fore-gut. It is also apparently 
larger than in T. thalassema, but here the difference is not so great. 
The precloacal intestinal coecum is rather large. The cloaca is dis- 
tinctly elongate, with translucent walls. The anterior chamber, com- 
prising about half, has a longitudinally plicated mucosa; the posterior 
or cloaca proper has smoother walls and is separated from the anterior 
by a constriction. The gland cells surrounding this part of the cloaca 
of 7’. thalassema, figured by Rietsch (1886, pl. 21, fig. 105) and called 
the perianal glandular organ by Jameson (1899, p. 555), must be absent 
or greatly reduced in thickness in philostracum, as the walls are every- 
where thin and translucent. 
The pellets that crowd the intestine are composed of gray mud with 
clear quartz sand and fragments of shells; the latter are often too large 
to be included in the pellets. 
The vascular system conforms to the Thalassema pattern. 
Color in life: Body deep red, proboscis white (Hartman). 
Type.—U. 8. N. M. No. 20802. 
Type locality—Thornton Island, near Englewood, Gulf coast of 
Florida. Common in muddy pockets of dead shells. Dr. Olga Hart- 
man collector, January 15, 1938. 
Specimens examined.—Thornton Island, 24; Lemon Bay Flats, Fla., 
January 14, 1938, 1, in tip of dead conch; Beaufort, N. C., 1. 
Remarks.—This species differs from TJ. steinbecki Fisher (1946, 
p. 230, fig. 11) in having a much longer fore-gut and a much longer pre- 
siphonal segment of the intestine. In steinbecki the gizzard and stom- 
ach are very short, the nephrostome is of the same shape but smaller, 
and the anal vesicles longer. Both species have a small seta hook, that 
of steinbecki being more angular, as if the tip were bent at right angles 
to the shaft. 
