418 
THE VOYAGE OF H.M.S. CHALLENGER. 
In the posterior region of the body, again, a great change ensues, for the central part 
is occupied by the alimentary canal, the intermediate region by the generative products, 
and the lateral by the great longitudinal muscles. The ventral form two compact oval 
masses with the nerve-cord and the neural canal at the upper and inner angle of each, 
and separated by a considerable interval. The dorsal muscles are much larger, have a 
convex outer and a concave inner border, and are somewhat pointed superiorly. They 
are more widely sejDarated than the ventral. 
The Sabellaria saxicava, Baird,^ from Vancouver Island, is an allied form with similar 
palese. It is not, however, a “ saxicavous ” form, the sandy tube being covered over with 
a crust of MeJohesia, and being lengthened as the latter increases. 
This species also approaches Grube’s^ Sabellaria [Pallasia) sexhamata from the 
Philippines, but differs in the number and structure of the hooks, and also in the outline 
of the external paleae. The number of the hooks is not a character of much moment, 
since in sections of the present species several reserve-hooks are found, and Haswell makes 
similar observations in regard to the allied form, Sabellaria anstraliensis.^ 
Sabellaria {Pallasia) capensis (Schmarda) (PI. XXVa. figs. 24, 25 ; PI. XXVIa. figs. 
11 , 12 ). 
Hermella capensis, Schmarda,' Neue wirbell. Thiere, I. ii, p. 23, Taf. xx. fig. 171. 
Habitat. — Collected between tide-marks at Sea Point, near Cape Town, Africa, where 
it was first found by Schmarda and subsequently by Kinberg. 
The largest example measures 90 mm. in length, with a diameter at its widest part 
of 6 ’5 mm. Schmarda states that his sjDecimens were 70 mm. in length. 
This form is nearly allied to the ordinary Sabellarice, differing from Sabellaria 
alveolata in having only two rows of palese, the shape of the inner being such that it 
compensates for the absence of the second inner row. Schmarda describes and figures ^ 
the palese as notched at the tip, but this is hardly accurate, since the thin spathulate tip 
has a chitinons fold on the under surface, the end of which projects in the form of 
a spur directed dorsally (PI. XXVa. fig. 24). When viewed in certain positions, as 
obliquely from above, the appearance of a notch is simulated by the arrangement. On 
the other hand, a lateral view (PI. XXVa. fig. 25) gives a hatchet-shape to the whole 
organ, and the terminal spur is very prominent. The palese are crossed by curious 
transverse lines, which, especially along the convex edge, assume a wavy direction ; and, 
moreover, a scaly aspect, apparently from wear, occurs along the same edge near the tip. 
While it is possible to recognise these palese in Schmarda’s description and figure, it is 
^ Proc. Zool. Soc. Land., 1863, p. 109. ^ Annelidenfauna d. Philippinen, p. 219, Taf. xiv. fig. 1. 
^ Proc. Linn. Soc. New South Wales, 1882, vol. vii. p. 634, pi. xii. figs. 7-11. 
* Neue wirbell. Thiere, I. ii. p. 23, fig. a. 
