W. H. Leigii-Spiarpe 
31 
will render this new species easily recognisable to the unaided eye. The trunk 
is joined to the cephalothorax by a stout neck, in which an anterior region 
is demarcated, but there does not appear to be any projecting “shoulder” for 
the location of the male as in L. scyllicola. The animals are of the usual pale, 
translucent, straw colour, but the ovisacs are densely white and opaque. 
The Appendages, all paired, are the first antennae (antennules), second 
antennae, mandibles, first maxillae, second maxillae and one pair of maxilli- 
pedes. 
The 1st Antenna (antennule) (Fig. 2) is four-jointed, the basal joint being 
much enlarged, somewhat spherical and having a curious spiral turn upon 
itself. The other joints are of approximately equal size, if anything the middle 
joint is the smallest. The terminal joint bears three long spines. Except in 
the last trifling detail, this appendage is the same as in L. scyllicola. 
The 2nd Antenna (Fig. 2) consists of a basal joint bearing a large unjointed 
endopodite with a blunted end, and a small exopodite whose diameter is a 
quarter of that of the endopodite, and which is distinctly two-jointed, the 
terminal joint bearing three small spines. This conforms exactly with the 
description of L. galei, and not with that of L. scyllicola. 
Fig. 2. Lernaeopoda globosa, the appendages. The antennule, antenna, first maxilla, and mandible. 
Ex. exopodite; En. endopodite. 
The Mandible (Fig. 2) resembles that of the majority of the Lernaeopo- 
didae, and is distinctly in contrast with that of L. scyllicola. The teeth are 
rounded and point posteriorly on the inner side of the blade; six appears to 
be a typical number, of which the first two are slightly the larger, the first 
being terminal; the others decrease in size posteriorly. The extremity 
of the shaft thus recalls the arrangement met with in certain uncini of post- 
larval specimens of Arenicola, a point I have not sufficiently accentuated in 
the figure. It would appear, then, that those species which live on the softer 
tissues (gills, olfactory sacs as in this species) have rounded teeth, while 
L. scyllicola, which has to rasp away the epidermal cells of the extra-cloaca 1 
region, or claspers, has serrate teeth. 
The 1st Maxilla (Fig. 2) is the most constant appendage throughout the 
genus Lernaeopoda. It consists of an unsegmented endopodite, and a well 
