Notes on the morphology of the Tunicata. 549 



This is purely a surmise with no evidence in its favor ^). It may 

 possibly be that the lateral chambers in the neural gland of Molgula 

 ampuUoides are also comparable with the ventro-lateral chambers of 

 the gland in Salpidae. This, however, is improbable. The only or- 

 gans in the Tunicates, which, in the present state of our knowledge, 

 it is reasonable to attempt to compare with the neural gland of Sal- 

 pidae^ are the lateral ducts and accessory funnels of the gland in 

 Ascidia atra, Ascidia marioni, Phallusia mammillata and Folycarpa 

 sulcata (?) ~). These are lateral connections between the gland and 

 the cloaca (or pharynx in one species). If a study of their devel- 

 opment should show that they arise wholly or in part from the epi- 

 thelium of the pharynx, or cloaca, it would then be very probable 

 that they correspond to the neural gland of Salpidae^ or rather that 

 the gland of the Salpidae represents a modification of one pair, or a 

 few pairs, in the elongated series of lateral ducts in the four Asci- 

 dians mentioned^). 



The Octacnemidae. 

 Plate 40, Figs. 82—84 and 86-88. 



MosELEY*) and Herdman^) have described the neural gland in 

 Octacnemus hithyus. Their figures of the gland are copied in Plate 40, 

 Figs. 82 and 83. I have had for study 15 specimens of Octacnemus 

 patagoniensis Metcalf. Although these specimens are very poorly 

 preserved, I am able to make out clearly from sections the character 

 of the neural gland and the adjacent organs. 



The ciliated funnel is large and shaped as in the Clavelinidae 

 (Fig. 88; cf. Plate 34, Fig. 8). It lies underneath the anterior third 

 of the ganglion and extends in front of the ganglion about an equal 

 distance (Fig. 86). Dorsally it narrows into a duct which, though 

 much smaller than the funnel, is still a chamber of considerable size 

 with convoluted walls (Fig. 88). From this chamber a slit on the 



1) I hope soon to obtain material for studying the neural gland 

 in Doliolum. I should be grateful to any one who would send me 

 sexual or "nurse" or Phorozooid forms of any species of Doliolum. 



2) From v. Deache's description of the gland in this species I 

 do not feel sure that it should be mentioned in this connection. 



3) Cf. Metcalf, 18952, p. 355—362. 



4) MOSELEY, 1876. 



5) Herdman, 1888. 



