145 



HABITAT. The marsupium of Amjpelisca macrocephala Lilljeborg from Denmark. 

 Only a single infested specimen has been found , and in the anterior part of its marsupium 

 occurred: a deformed female, which had probably finished laying- eggs, one male and seven 

 mutually adhering ovisacs, one of which contained full-grown larvae; in the hindmost part 

 appeared the large female represented, one male and six mutually adhering ovisacs; one 

 ovisac had fallen out before its place was ascertained. 



REMARKS. The name of the species points to the remarkable cup on the frontal 

 margin of the female. The male deviates much from all other hitherto known forms. 



26. Sphaeronella microcephala Giard and Bonnier. 



(PI. VIII, fig.2a-"2k). 



Sphcero?iella microcephala Giard and Bonnier, Compt.-rend. de I'Acad. des Sc, 25 sept. 1893. 



— Bull, scientifique de la France et de la Belgique, T. XXV, 



fasc. 2, 1895, p. 464, pi. Xll, fig. 40-47. 



FEMALE. The largest specimen, which had only just begun laying eggs, was 



144 mm. in length and of the same breadth and thickness (fig. 2a), sub-globular, yet. a little 



produced and almost pointed towards the front, which is due to the fact that the trunk 



merges evenly into the head without any separation. The frontal border is present as a 



small crescent-shaped transverse plate (fig. 2e), which is scarcely double the length of the 



diameter of the mouth; lateral borders are wanting (fig. 2d); so we only find the various 



appendages and a tolerably developed sub-median skeleton, but, as the lateral parts of the 



skeleton, viz. the lateral borders, are wanting, this parasite differs from all the preceding, 



but agrees with several of the following species of this genus, in having no lateral limitation 



to the surroundings of the mouth-limbs. Antennulse very short, without distinct vestiges of 



articulation, with a seta on the anterior margin at a short distance from the base (no doubt 



corresponding to the usual pretty long seta at the anterior angle of the first joint), and 



four terminal setae of unequal length, the longest of which are a little longer than the 



antennula. Antennae seem to be altogether wanting. The mouth of medium size, with a 



rather narrow mouth-border. Maxillulse well developed, with good-sized additional branch. 



Maxilhe far removed from the rostrum and much closer together than in any other species 



of the genus; the basal joint large and smooth. Maxillipeds small and feeble; their basal 



joint pretty short, very slender and naked, the second and third joints fused into a very 



short and slender joint; the last joint scarcely half the length of the preceding, rounded at 



the end; the reduced state of the two (or three) last joints, in particular, proves this pair 



of appendages to be almost valueless as prehensile organs. The sub-median skeleton is 



provided with a somewhat prominent list on each side of and at a short distance from the 



19 



