, 44 DISCOVERY REPORTS 



Occurrence. St. 936: North Island, New Zealand, 50-57 m. 



External appearance. The specimens are ovoid, and have a greatest diameter ranging from 3 to 

 6 mm. A complete covering of sand conceals the body, and, at least in the preserved state, no siphons 

 are visible externally. 



Test. The test is very thin, flexible and transparent, when the coat of sand grains has been removed. 



Body wall. The body wall also is thin and has narrow muscles, consisting of circular strands 

 mainly on the upper half of the body, and longitudinal strands radiating from the siphons and ex- 

 tending about half way across the body. 



Tentacles. There are ten to twelve tentacles of at least two sizes, the larger ones being tri-pinnate 

 and quite bushy (Text-fig. 65 B). 



Dorsal tubercle. The dorsal tubercle, which lies below the anterior end of the ganglion, is small 

 with a simple longitudinal slit, either straight or very slightly curved (Text-fig. 65 C). 



Branchial sac. In the branchial sac there are six longitudinal bars, more closely spaced in the 

 dorsal part of the sac, but no folds. Below each bar lies a longitudinal row of infundibula, and in 

 addition there are a few infundibula between the dorsal bar and the dorsal lamina, and a few between 

 the ventral bar and the endostyle, in each case at the antrior end of the branchial sac. The infundibula 

 project only very slightly from the surface of the branchial wall. Each infundibulum consists of two 

 parallel spiral stigmata (Text-fig. 65 D). The dorsal lamina is a plain narrow membrane. 



Gut. The oesophagus is short and leads to the small barrel-shaped stomach (Text-fig. 65 A, st.) 

 which is scarcely wider than the intestine. The proximal part of the intestine is horizontal, and the 

 distal part together with the rectum make an S-shaped bend, leaving an open area at the bend of the 

 primary loop in which the single gonad is accommodated. The anus has a plain margin. 



Gonad. The gonad consists of a central sac-shaped ovary (Text-fig. 65 E, ov.) with, applied to its 

 mesial side, a radially arranged group of eight to eleven testis lobes (t). These lobes are slightly 

 branched and may project far enough from the sides of the ovary to lie against the surface of the 

 intestine. The oviduct (od.) is short and projects upwards towards the atrial siphon. A single short 

 sperm duct (s.d.) is placed centrally within the rosette of testis lobes. 



Renal sac. The renal sac is small but quite conspicuous owing to its almost white colour. It lies 

 close against the stomach, on its postero-ventral side. 



Remarks. This small sand-covered species, which could easily be overlooked, does not seem to 

 have been found or recognized in previous collections. 



Distribution. North end of North Island, New Zealand. 



Eugyra arnbackae sp.n. (Text-fig. 66; PI. IV, fig. 3, PI. VI, fig. 6, 7) 



Holotype. Size: body 12 mm., stalk, 100 mm. 



Diagnosis of species. Body with a long slender stalk, arising near the oral siphon. Tentacles 

 about sixteen, slightly branched. Dorsal tubercle with a simple longitudinal or oblique opening. 

 Branchial sac with seven longitudinal bars on each side. Stigmata in double spirals. Right gonad 

 above renal sac; left gonad in secondary intestinal loop. 



Occurrence. St. 366: S. Sandwich Islands, 155-322 m. 



External appearance (Text-fig. 66 A, B ; PI. IV, fig. 3). The body is small and ovoid with the low 

 conical siphons situated far apart on the dorsal side. A long and very slender stalk (Text-fig. 66 B, sk.) 

 arises from the anterior end of the body, a little below the oral siphon (o.s.). The lengths of body and 

 stalk of six specimens are : 



Body length (mm.) 12 10 9 8 8 7 



Stalk length (mm.) 95 75 92 87 65 62 



