144 BULLETIN 100, UNITED STATES NATIONAL MUSEUM. 



had no specimens of the aggregated zooids, nor is the stolon in our 

 specimen sufficiently developed to tell anything of their character. 



Of all described Salpas, the solitary form of the crested subspecies 

 of Traustedtia multitentacvlata is by far the strangest and most 

 bizarre in form. A complete verbal description is useless. The 

 figures need, however, some description, if the peculiar crests and 

 protuberances from the surface of the test are to be clearly under- 

 stood. 



The body is, in general, elongated ovoid, 7h mm. long, the posterior 

 end a little broader and considerably deeper than the anterior end. 

 The test is much thickened below and considerably thickened on the 

 sides of the body, but along the mid-dorsal line is a rather narrow 

 area of thinner test. On each side of this thinner mid-dorsal strip 

 the thickened test of the sides rises up into a huge longitudinal crest 

 with a coarsely toothed dorsal margin. These structures may be 

 called the dorso-lateral crests. The anterior edges of the crests are 

 continuous below with the anterior edges of the thickened lateral 

 areas of test. Similarly the posterior edges of the dorso-lateral crests 

 are continuous below with the posterior and dorsal edges of the 

 lateral and ventral area of thickened test. It is as if an envelope of 

 greatly thickened test were laid under the ventral surafce of the 

 body and bent up around the sides, its upper edges not meeting on 

 the dorsal surface but being elevated into two independent dorso- 

 lateral crests, the anterior end of the body and the atrial siphon, 

 covered only with thin test, protruding in front and postero-dorsally 

 from the thickened envelope. 



The test over the lower lip is somewhat thickened and is coarsely 

 and irregularly papillate, the individual papillae resembling the 

 irregular teeth upon the edges of the dorso-lateral crests. The mid- 

 dorsal line of the upper lip bears a row of similar irregular papillae; 

 so also do the mid-dorsal and the mid-ventral lines of the atrial 

 siphon. Over the sides of the body, especially along the mid-lateral 

 region, are similar papillae. 



The great ventral thickening of the test is even more strongly 

 emphasized posteriorly, where it forms a great pouch containing the 

 viscera. This postero-ventral thickening is broad from side to side, 

 its postcro-dorsal edge showing two strongly toothed ridges running 

 from side to side. The lower is the smaller of the two; the upper 

 forms a sort of trans verse crest behind and below the atrial siphon. 

 Observation of the figures should, with this description, make the 

 form clear. 



As noticeable as the crests and ridges are the 13 "tentacles." 

 These are of essentially the same character as the postero-lateral 

 tubular protuberances in Thalia (fig. 104, p. Ill) and Thetys (fig. 114, 

 p. 122). Their positions are shown in the figures: a ventro-lateral 



