Species of the Genius Alepas. 197 



elastic fibres, obliquely binding the epithelial surfaces one to 

 the other. 



The chitinous cuticle which clothes the inner part of the 

 mantle is thin, transparent, and interspersed with comb- 

 shaped chitinous ornaments with a greater or less number 

 of teeth, sometimes one only, irregularly placed and serving 

 to retain the ovigerous sac in the intrapallial cavity. 



Mouth. — The labium has on its free margin fourteen short, 

 strong, and blunt chitinous teeth, separated into two series 

 of seven by a smooth space; the lateral parts are furnished 

 with stiff and short but fine bristles. 



The palpi are flattened and provided with long barbed 

 bristles over about half their length (fig. 5). 



The mandibles have four strong teeth on their free margin. 

 The distance between the first and second slightly exceeds 

 that between the points of the second and fourth (fig. 6). 



The median dorsal region is covered with short, stiff, but 

 rather fine bristles ; the lateral faces of the teeth are fur- 

 nished with strong, short, and pointed bristles, especially well 

 developed in the vicinity of the last three teeth. 



The maxillaz have the free margin divided into two un- 

 equal parts by a deep notch. The upper part is furnished 

 with a very strong chitinous tooth, which continues the dorsal 

 margin, and a smaller one. The lower part is scalariform 

 and bears three short and thick projections, between which are 

 finer bristles, uniformly not barbed, which likewise cover the 

 lateral parts of the maxilla (fig. 7). 



The labial palpi of the lower lip are broad, nearly square 

 in shape ; the anterior free margin is divided by a notch 

 into two unequal parts, the upper part about three times 

 as broad as the lower. The upper dorsal region of the 

 palp is covered with long fine bristles collected in a thick 

 tuft. These bristles become shorter and stiffer on the lower 

 parts. Finally, on the posterior part are irregular bristles, 

 bent and few in number (fig. 8). 



Cirri. — The cirri are generally very long, covered with 

 long fine bristles, especially long towards the free extremity 

 of the rami. The first pair is somewhat sharply separated 

 from the others. 



1st pair. — This is much the shortest. The two rami are 

 unequal. The anterior ramus, formed of 13 rather short 

 joints (the basal joint being almost equal to four ordinary 

 joints), bears numerous long, fine, and barbed bristles on its 

 posterior border ; these being much fewer on the anterior 

 border. The posterior ramus is formed of 21 joints (the 

 first being nearly equal to four ordinary joints). The hairs 



