86 DEPARTMENT OF TEE NATAL SERVICE 



The parapodia are 18 in number, the last two being rudimentary. There are 

 none on tJie tail, which is very slender. 



A rosette is present in the middle of the lower side of the trunk of each of the 

 first two parapodia of the right side, but none can be seen i-n those of the left side. A 

 rosette is present in the fin just inside and close to the tip of both rami of all the 

 parapodia with the exception of the first two pairs. A spine projects from a slight 

 notch in the ventral part of the fin of the ventral ramus of each parapodium, but is 

 indistinct in the first ones. A^ hyaline gland is closely applied to the outer side of 

 the spine in all the parapodia. A chromophile gland is placed just inside the spine 

 on the parapodi'a, beginning with the fifth pair. 



The single specimen was obtained at " Acadia " Station 75, in the vertical haul 

 ,from a depth of 325 metres. This species has heretofore been known only from two 

 specimens reported by Eosa from the Pacific coast of Mexico. It is very evidently 

 a tropical form, and is the only Tomopterid obtained on the expedition that is 

 restricted to the southern oceanic water of the Gulf Stream. 



Tomopteris (Johnstonella) catharina j^osse), 



1900. Apstein, p. 38 (as T. helgolandica) 

 1905. Reibisch, p. 8 (as T. helgolandica) 



1907. "Wright, p. 12 (as T. mariana) 



1908. Rosa, p. 283 



1911. Southern, p. 8 (as T. IhJgolnnrlira) 



1911. Malaquin et Carin, p. 11 (a:5 T helgolandica) 



Up to 6 cm. in length. This is the largest, as well as the most common, 

 Tomopteris of the region. 



It is described as possessing the first pair of setigerous tentacles. All the 

 individuals that I have examined, have been without them but none smaller than 11 

 mm. has been available. This is in rather striking contrast with the condition in 

 European individuals, in which it is usually present unless in rather large specimens. 



Wright obtained off Canso a young Tomopterid, which he indentified with the 

 Tomopteris mariana of Greef as described by Apstein, evidently relying upon the 

 presence of a rosette in the basal joint of each of the first two pairs of parapodia. An 

 individual, 1.2 mm. in length, from "Acadia" Station 81 on the St. Pierre bank showed 

 the same condition, but closer inspection revealed the fact that the rosette in reality 

 was in the base of the ventral ramus. I believe, therefore, that these belong to T. 

 catharina. This diagnosis is confirmed by' their occurrence only on the St. Pierre 

 bank, where adults of the species were most abundant. 



Individuals with eggs free in the coelome were obtained on both cruises, at 

 "Acadia" Stations 19, 21, 80, 81 and 83, and at "Princess" Station 45. 



DISTRIBUTION.* 



C.G.S. Acadia. 



Station No 10 11 12 13 19 21 23 24 25 26 



Depth of Haul (m.)... (T) (T) 100-0 (V) 70-0 (V.) fT) (Tl 70-0 (V) 100-0 (V) 120-0 (V) 100-OfV) 



Length (mm.) 20 20-32 32 & 37 20 & 30 18-37 20-40 28 18-27 Ca.22 Ca. 20 



Number 16 2 2 11 24 1 6 5 3 



Station No 26 27 34 '35 36 50 80 80 81 



Depth of HauKm.)... (T) (T) 100-0 (V) 125-25 (C) 100-15 (C) 145-0 (V) 145-0 (V) 55-0 (V) 55-0 (V) 



Length (mm ) 18-30 20-40 15-30 15-40 25-30 42 30-45 Ca. 30 juv. 



Number 3 19 5 5 3 1 4 1 1 x 10 



Station No 81 83 83 83 84 84 86 



Depth of Haul (m.). .Ca.20-10 (T) 160-0 (V) 55-0 (V) Ca. 20-10 (T) Ca. 20-10 (T) 55-0 (V) Ca. 20-10 (T) 



Length (mm.) 30-47 30-40 30-60 25-40 juv. 20-30 juv. 25 



Number 6 13 7 many several 6 1x5 1 



* In the tables of distribution the following abbreviations are employed, — T for " Tow " ; 

 V for "Vertical haul from a certain depth to the surface"; and C for "Vertical haul between 

 certain depths, net being closed before bringing to the surface." 



