OCR Text |
Show 1888.] MYRIOPODA, ETC. OF CHRISTMAS ISLAND. 559 side to side; the inferior surface less arched, with its plane meeting the plane of the lateral surface almost at right angles. On the under surface, near the point of junction of the two surfaces, there is a shallow constriction which gives each somite the appearance of being furnished below on each side with a rounded keel-like prominence. These prominences form a continuous series extending from the lateral margin of the first tergite to the posterior end of the body, a series which corresponds with the series of inferior keels found in some ( ? all) species of Strongylosoma. _ Foramina repugnatoria small, circular, with slightly raised margins, situated in the middle of the sides of the same somites, as in Strongylosoma, but not supported upon even a trace of a keel; those in the anterior region of the body situated in the anterior portion of Fig. 2. Cylindrodesmus hirsutus. the posterior half of each somite, those in the posterior region of the body in the posterior portion of the posterior half of each somite. Anal tergite produced behind into a short rounded prominence which slightly overlaps the anal valves; margins of valves not raised ; subanal plate somewhat quadrate, with slightly concave and converging lateral margins, and slightly concave posterior margin, at each end of which is a prominent tooth. Legs hairy. Copulatoiy foot of the male consisting of two segments; proximal segment, half of which is inside the body, slender and cylindrical above, stout below, and membranous on the inner surface, where it comes into contact with its fellow on the opposite side ; from its distal extremity on the inner surface springs, at right angles to it, the distal segment, which projects forwards parallel to the long axis of the body ; this segment has the form of a slightly waving rod which is sharply upturned towards the distal |