22 THE VOYAGE OF H.M.S. CHALLENGER. 



number, and were sometimes united in pairs at their origin on the periphery. The 

 superior surface, part of the anterior end, but especially the under side of this stomach, 

 were enveloped in the ordinary glandular layer of the Marseniadse. This white coat 

 extended further along the lower side of the bulbus pharyngeus, quite covering and partly 

 enveloping the pedal ganglia. From the pyloric end of the foliated stomach a short 

 canal extended in the usual fashion (fig. 22, d) to the true stomach. The latter was rather 

 spacious, rounded at the right-hand end, and its walls almost without a fold. The 

 stomach was continued on into the intestine almost without a boundary. The latter 

 formed the ordinary bend (fig. 8), and ended at the anal papilla, on the left side of the 

 vulva (fig. 27, b). Close to the pyloric was situated the large round bile-duct opening. 



The stomach and the intestine were filled with indeterminable contents, and the rectum 

 contained compressed white excrement balls, having a diameter of as much as 1 mm. 



The liver was large, white externally and greyish yellow internally. 



The pericardium and heart exhibited the usual structure. Posteriorly, on the internal 

 wall of the former, the round pericardiaco-renal aperture was seen with unusual dis- 

 tinctness (fig. 24, a). 



The kidney was formed of the ordinary glandular bands ; the pericardiaco-renal 

 aperture above mentioned was more distinct than the opening into the branchial cavity 

 which lay at the base of the posterior wall somewhat to the left. 



The large foliated gland (fig. 8, b) exhibited the typical structure, which was, however, 

 specially well developed (fig. 25). 



The branchia was provided with about 75 leaflets, which (fig. 23) hung down to a less 

 extent and straighter than is elsewhere the case among the true Marsenice. On the sides 

 of the leaflets the characteristic transverse folds of the Marsenice were also observed (fig. 23). 



The ovary was very large, and occupied most of the posterior half of the wide, terminal, 

 visceral winding (fig. 8, a). The ordinary structure was exhibited, and large oogenetic cells 

 were seen in the lobules. The short oviduct led, posteriorly and to the right, into the 

 upper end of the mucus- and albumen-gland. Behind this, shining through the thin layer of 

 the foliated gland, the calcareous-white, spherical, seminal receptacles (fig. 8) could be seen. 

 These attain a maximum diameter of 1 mm. Four were present, swollen with semen, and 

 of almost equal size. The ducts were about twice as long as the seminal receptacles, and 

 opened close together on the right side of the mucus- and albumen-gland (fig. 26, b). This 

 gland (fig. 8, c) measured about 6 mm. in length, with a maximum breadth of 4 mm., and 

 a thickness up to 4 mm., was of a yellow white colour, and presented the ordinary finely 

 granular appearance (fig. 26, a). It consisted, as usual, of a right aud a left portion, differing 

 slightly in colour. The structure and the flattened cavity exhibited the usual characters. 

 The vagina (fig. 27, a) was short and strongly developed ; the thick, muscular diverticulum 

 (fig. 27, c) about 3 mm. long, ascending along the right side of the mucus gland ; the 

 cavity was narrow, with longitudinal folds on the wall. 



