348 DISCOVERY REPORTS 



The Discovery specimens from Marion Island differ from the type material from 

 Kerguelen in the possession of frontal avicularia. These avicularia are small and are 

 present on most of the zooecia, including one or both of the axillary zooecia (Fig. 12 A). 

 Here they are placed proximally to the joint, with the beak turned towards the axil. 

 In other respects the specimens agree very closely with the type. Oval areas may be 

 present in the lateral walls (see p. 339). 



A small colony of this species (87.12.9.97 B) was separated by Levinsen from the 

 type material of Amastigia kirkpatricki, but left unnamed. Frontal avicularia are 

 present on some zooecia, but not on the axillary ones. 



One young colony with ancestrula (Fig. 13 A) was taken at St. 1563 (Marion Island, 

 7 April 1935). The ancestrula resembles that of Notoplites tenuis in shape. There are 

 seven spines round the opesia and there may have been an eighth where the ancestrula 

 is now broken. The first zooecium is connected to the ancestrula by a rather long tubular 

 portion, and has seven spines and a small scutum. The second zooecium also has seven 

 spines. The remaining nine zooecia have six spines each (4 : 2), but the scutum approxi- 

 mates to the adult form from the third zooecium onwards. 



6. Notoplites elongatus var. calveti var.n. Fig. 12 C, D. 



Cellularia elongata Calvet, 1904, p. 5. 



Station distribution. Sub- Antarctic: South Atlantic Ocean, Sts. 51, WS 73, WS 79, WS 83, 

 WS 84, WS 85, WS 88, WS 225, WS 237, WS 243, WS 244, WS 245, WS 247, WS 781, WS 794, 

 WS 824, WS 825. 



Geographical distribution. Patagonian Shelf (Calvet; Discovery); off Patagonian Shelf down 

 to 315 m. (Discovery). 



Holotype. St. WS 237, off Patagonian Shelf. 



These specimens from the Patagonian region appear to constitute a distinct 

 variety of Notoplites elongatus. They differ from the type material from Kerguelen in 

 having an axillary avicularium in many of the bifurcations. There is also a slight dif- 

 ference in the ovicell, the calcified part of the ectooecium being more extensive in var. 

 calveti (cf. Figs. 12 B and C). In both the typical form and the variety there is a narrow 

 smooth cryptocyst and the edge of the gymnocyst bordering the aperture may be very 

 finely beaded, but in var. calveti there is coarser beading on the distal border of the 

 aperture of the fertile zooecium, a region which is smooth in the type. The scuta are 

 similar in shape and show curved, longitudinal lines when dry. The shape of the lumen 

 of the scutum is variable in both, but it is usually narrower proximally in var. calveti 

 than in the typical form (cf. Figs. 12 A, B and C). Var. calveti also differs from the type 

 material in possessing frontal avicularia, but, as described above, these are present in 

 specimens from Marion Island, believed to belong to the typical form. The distribution 

 of the avicularia is, however, different. When present in the typical form they are found 

 on nearly all the zooecia. In var. calveti they are rarely found except in association with 

 ovicells (Fig. 12 C) and on the median zooecium at the bifurcation. 



The axillary basal avicularium originates from the side of zooecium F (Harmer's 

 lettering), and projects into the axil. The opesia of the avicularium is on a level with the 



