183 



likely — recently hatched animals (comp. my observations about other species, stated above 

 on p. 58 and p. 60). — The head is much narrower and somewhat shorter than the trunk; 

 seen laterally (fig. 2 f) , the limit of the hair-coat runs from the base of the maxillipeds 

 upward and in a slightly oblique direction forward across the side and the back, and the 

 two flatly conical eminences (x) are placed somewhat in front of the limit. Seen from below, 

 the distance between the outstanding lateral borders of the head is much shorter than its 

 broadest diameter; in fig. 2e — partly on account of the position of the animal — the out- 

 standing frontal border does not reach the front outline of the head. The frontal border 

 scarcely attains to medium breadth, yet it is much broader than in the preceding species, 

 slightly produced, with pretty well curved margin. Antennulae rather short, 2-jointed; second 

 joint somewhat shorter and a little narrower than the first one, with comparatively short 

 sette and a sensory seta which nearly equals the others in length. Maxillae of medium 

 size; the terminal margin of the basal joint as in the female. The basal joint of the maxil- 

 lipeds has on its outer side only one process which is placed at its distal end and which, 

 though good-sized, is much smaller than in Mys. commune; the next joint has no process, 

 but bears a pretty large spine inside the base of its short terminal joint, Everywhere, 

 except on the front part of its ventral surface, the trunk is covered with simple hairs of 

 nearly average length. We see furthermore on the ventral side two long lines (fig. 2 e, u), 

 running right and left of the median line at some distance from it; posteriorly they are 

 further removed from this line, and near the posterior margin they recurve, continue forward 

 and outward, and soon vanish altogether; what these two lines are meant for is quite 

 incomprehensible to me. — The afore-mentioned dwarfish specimens were attached by a 

 peculiar frontal thread (fig. 2 d and fig. 2 g), which is a little longer than the body ; the thread 

 (in both specimens) was fusiform near its centre, and thickened by a high collar at its 

 broadest point, and somewhat in front of its distal end appeared a similar, but still wider 

 expansion with a similar collar; the distal end by which it is attached (not drawn in the 

 figure), seems to have been discoid. 



OVISACS. They are exactly like those of the preceding species, varying in the 

 same way as to size and shape. 



LARVA. A full-grown specimen pulled out of an ovisac is represented in fig. 2h, 

 (the natatory legs are omitted); if is -196 mm. long. The cephalothorax very elongated, 

 scarcely twice as long as broad. The front has a sinuate oblique list inside the base of 

 each antennula. The purpose of the two transverse stripes rendered in the illustration, is 

 not clear to me. Antennulse 3-jointed; olfactory seta scarcely half the length of the 

 cephalothorax. Antennas very short, consisting of three very short, comparatively thick 

 joints, the last one terminating in an exceedingly short seta. Of the maxillulae only 

 two branches are seen, one of them long, powerful and originating comparatively 

 far towards the front, the other very short, spiniform and situated further backward. 

 The basal joint of the maxillae bears some very short hairs at the distal end of its inner 



