REPORT ON THE ENTOZOA, 
D 
3. Ascaris bilobci, n. sp. (PL I. figs. 8, 9). 
Specimen labelled : “January 1876 ; Straits of Magellan.” 
The host is not noted ; the vessel contained five specimens, which were immature 
females, with the ovaries and uteri well developed, but without ova. 
The maximum length was 48 mm., the breadth 2 - 2 mm. The body is rounded off at 
both ends, and the posterior extremity is the thicker. The cuticle is thick and trans- 
versely wrinkled at intervals of 0T4 mm., while between these main markings there is a 
finer transverse wrinkling, with intervals of 0'006 mm. The musculature is divided by 
the usual four longitudinal ridges into four longitudinal bands ; the dorsal and ventral 
ridges measure 0T3 mm. in breadth, the two laterals 0‘24 mm. The head bears three 
lips, with dentigerous plates and accessory lips ; the upper lip is pentagonal with rounded 
corners, and is about as long as broad, measuring 0’25 mm. in length and 0’26 mm. in 
breadth ; the base is 0'098 mm. broad. The anterior margin bears a dentigerous plate, 
and the pulp broadens from the base forwards for the first third of the length, at this 
point there are two large papillse, thence onwards it narrows markedly, and forms two 
anteriorly rounded terminal lappets. The conical accessory lips are 0T5 mm. in length; 
the oesophagus has a length of 4 mm. ; the vulva lies in the ventral line a little in front 
of the middle of the body, and the anterior region thus marked off bears to the posterior 
portion the proportion of 23 to 25. The anus lies 0'3 mm. from the tail end; the 
extreme point of the tail is produced into a minute finger-shaped point, 0'048 mm. in 
length. 
There can be no doubt that this species is indeed parasitic, for there are no known 
free-living Ascarids in which the structural features entirely correspond to those of 
parasitic forms. 
Schneider 1 describes the following Ascarids, in which the lips bear tooth plates and 
accessory lips are developed : — Ascaris depressa from Vultur fulvus, and Ascaris cnsi- 
caudata from singing birds (with upper lips, and with a mouth aperture exhibiting 
anterior processes quite different from the above), Ascaris rubicunda from Python molurus, 
and Ascaris radiosa from Echidna rhinocerotis (with the anterior processes quad- 
rangular), Ascaris quadrangularis from Crotalus, Ascaris holoptera from Testudo grseca, 
and Ascaris sulcata from Clielone midas (with the upper lip forming a quadrangular 
aperture). 
I have previously described 2 the following related species: — The above-mentioned 
Ascaris ensicaudata, Zed. ( = Ascaris cornicis, Gmel., Ascaris crenata, Zed., Ascaris 
heteromera, Crepl., Ascaris semiteres, Zed.), from Turdus, Sturnus, Corvus, Salicana, 
Vanellus, Himantopus, GEdicnemus, Charadrius (with an upper lip, with the maximum 
1 Loc. cit., pp. 40-44, tab. i. figs. 6, 7, 8, 9, 10, 11, 12. 
2 Archivf. Naturgesch., Jahrg. 1. Bd. i., 1884, pp. 125-127, pi. vii. figs. 1-3. 
