Mr. J. Lubbock on a new genus of Calanidse. 25 



lateral pair of eyes, and of a dark brown colour. Fakes small, 

 conical, armed with teeth on the inner surface, and mclmed 

 towards the sternum, which is heart-shaped : maxilla inclined 

 towards the lip, which is semicircular and prominent at the 

 apex : legs moderately long and hairy; the anterior and poste- 

 rior pairs are the longest and are equal in length, and the third 

 pair is the shortest; each tarsus is terminated by three claws; 

 the two superior ones are curved and pectinated, and the inferior 

 one is inflected near its base. These parts are of a pale brown 

 hue, the fakes being the darkest and the sternum having a tinge 

 of green. The four intermediate eyes describe a narrow, oblong 

 trapezoid, whose anterior side is the shortest, and those of each 

 lateral pair are seated obliquely on a small tubercle and are con- 

 tiguous ; the lateral eyes are the largest, and the two anterior 

 ones of the trapezoid are the smallest of the eight. The palpi 

 resemble the legs in colour, with the exception of the radial and 

 digital joints, which have a dark brown tint ; the radial is stronger 

 than the cubital joint, and projects two pointed apophyses from 

 its extremity, in front ; the digital joint is oval, convex and hairy 

 externally, concave within, comprising the palpal organs, which 

 are highly developed, prominent, complicated in structure, with 

 a short, curved, black, projecting spine at their extremity, and 

 are of a brown colour tinged with red. Abdomen small, oviform, 

 hairy, convex above, projecting over the base of the cephalo- 

 thorax ; it is of a yellowish brown colour, \n\h obscure marks of 

 a deeper shade. 



A specimen of this minute Walckemera, in a state of maturity, 

 was discovered among moss growing at the root of an oak in a 

 wood on the northern slope of Gallt y Rhyg in October 1853. 



III. — Description of a new genus of Calanidse. 

 By John Lubbock, Esq. 



[With a Plate.] 



Genus Labidoceea. {\a^l<;, forceps, and Kepaia, antenna.) 



Rostrum furcatum ; antenna antica maris dextra geniculans, 

 tumida, articulis quarto et quinto magna serrata lamella in- 

 structis. Oculi superiores duo, magni, distantes. Oculi infe- 

 riores nulli. Cephalothorax 7-articulatus. Maxillipedes exterm, 

 grandes, setis longis setulosis. Pes posticus maris dexter, crassus, 

 prehensilis. .^ 



Rostrum forked; superior right male antenna prehensik, 

 swollen, the ninth and tenth joints furnished each with a large 



