478 G. HERBERT FOWLER. 



Fig. 7. — View of the opposite side of the specimen shown in Fig. 6. The 

 inferior aperture of the digestive tract, the opening of the stomach, is here 

 seen [owing to the j-sliaped curvature mentioned in the text]. From the 

 eight rings [ridges ?] of tissue surrounding it radiate eight mesenterial 

 fringes ; from the margin [of] the stomach, here inverted, six tentacles [in 

 their pouches] are seen to proceed. On the peripheral extremities of [those] 

 mesenterial filaments which lie uppermost in the figure, ovaries are seen to 

 be present. Two large retractor muscles, in a completely retracted condition, 

 lie just above the tentacles which are lowermost in the figure. 



Fig. 8. — Base of the stomodseum [or rather, of the inturned part of the 

 column], showing its expansion, and the mode in which the tentacles [lying 

 in their pouches of the oral disc] proceed from its margin. The stomach 

 [stomodseum], lying beneath it, is hidden ; but the eight [mesenteries of the] 

 retractor muscles [which were torn away in the preceding figure] are seen 

 radiating from its margins, and some of the ovaries and mesenterial filaments 

 are seen in situ. 



Fig. 9. — Specimen viewed from the aboral surface, with a disc of the 

 inferior body-wall removed from the central region, to expose the viscera. In 

 the centre is seen the slit-like pleated inferior opening of the stomach 

 [stomodseum] surrounded by the eight mesenterial filaments which radiate 

 from it. Beyond these, and from beneath their bases, pass outwards the 

 eight long and large retractor muscles [and their mesenteries]. The dorsal 

 and ventral pairs of these [are the directives, and] are placed exactly opposite 

 and in line with each other, and enclose each a single intermesenteriai 

 chamber [formed by a ?] pair of mesenteries only [while the spaces between 

 the other pairs of primary mesenteries contain a large number of mesenteries 

 of the lower orders]. Between the bases of the muscles are seen the 

 tentacles, eleven of which only appear. [A twelfth is probably present in 

 the sector to the left of the uppermost directives.] The eight mesenterial 

 filaments correspond in position with the eight retractors. 



Fig. 10.— Much enlarged view of a but little compressed specimen laid 

 open so as to exhibit the essential internal structures (probably a combined, 

 more or less diagrammatic representation). The stomodseal tube [or 

 rather, the inturned part of the column,] is laid open, and it is seen that the 

 cuticle of the outer surface of the body, with its dense coating of sand and 

 shell particles, is continued to its base. Here it opens into a discoid 

 chamber, which may be called the tentacular chamber [formed by a folding of 

 the oral disc], since [the pouches for] the invaginated tentacles communicate 

 with it all round its periphery by open mouths. [In one of the pouches 

 pointing directly towards the observer, which has been cut across, the tentacle 

 can be seen lying as in a sheath.] In the middle of this chamber below, lies 

 the mouth, leading into the stomach cavity [stomodseum] below. The latter 

 is surrounded by the radiating retractor muscles, with the ovaries showing 



