124 BULLETIN 100, UNITED STATES NATIONAL MUSEUM. 



The Albatross collection contains, however, a new genus, which 

 is in many respects intermediate between Ciona and Phallusia, to 

 which the writer has given the name Ciallusia, a compound of parts 

 of these two well-known generic names. If the families Cionidae 

 and Phallusiidae require to be kept separate, which the new genus 

 seems to render somewhat doubtful, Ciallusia appears to belong in 

 the Cionidae on account of having the dorsal lamina replaced by 

 languets. 



CIALLUSIA, new genus. 



Body elongated, tapering (pediceled in the only species) ; both 

 apertures near together at the anterior end, the atrial aperture dis- 

 tinctly 6-lobed. Test gelatinous, transparent. 



Mantle with a few transverse but no strong longitudinal muscle 

 bands. 



Tentacles simple. 



Median dorsal vessel broad and flat; the dorsal lamina represented 

 by separate languets. Internal longitudinal vessels are present, but 

 bear no papillae. 



Course of digestive tract very straight, only the esophagus and 

 part in the vicinity of the stomach being curved, the remaining por- 

 tion running directly forward. It lies beside the branchial sac. 



Ovary beside the proximal part of the intestine. Male organs 

 ramifying upon the surface of the stomach and intestine. 



Type of the genus. — Ciallusia longa, new species. 



CIALLUSIA LONGA, new species. 



Body greatly elongated, laterally flattened, largest at the poste- 

 rior end and tapering gradually toward the anterior end. Branchial 

 aperture terminal, indistinctly lobed ; atrial aperture smaller, 6-lobed, 

 situated on a very short tube close beside the branchial aperture but 

 not extending forward so far. Body attached by the posterior end 

 by means of a long pedicel. (The pedicel is complete only in one of 

 the specimens. In this it is between two-thirds and three-fourths 

 of the length of the body proper, narrow where it joins the body 

 but wide at the other end where it gives off a number of rootlike 

 branches which anchored the animal in the sand or gravel in which 

 it grew. In the other specimens the pedicel appears to have been 

 similar, but it is broken off.) Dimensions of largest specimen: 

 body length (including pedicel) 93 mm.; greatest dorso-ventral 

 diameter (near posterior end of body proper), 24 mm.; length of 

 pedicel about 67 mm.; greatest diameter of pedicel (at end farther 

 from body), 17 mm.; smallest diameter of pedicel (near point of 

 origin from body), 4 to 5 mm. Test transparent and nearly colorless 



