46 PROCEEDINGS OF THE NATIONAL MUSEUM. vol. 60 



lary network in the third and fourth legs is especially profuse and 

 fully equals that found on the dorsal surface. 



The figures here given (figs. 59 and 60) of the vascular system were 

 made in 1905 from living specimens. Heider called attention to the 

 fact that this vascular system can not be recognized in specimens pre- 

 served in the ordinary way. And even in those which have been 

 treated by the most approved methods it is usually unrecognizable, 

 or at least it can not be traced in any detail. 



LERNANTHROPUS CARANGIS Hesse. 



Lernanthropus caranxi Hesse, Revue des Sciences Naturelles, vol. 7, 1878, 



p. S (reprint), pi. 1, figs. 1-7. 

 Lernanthropus carangis Bassett-Smith, Proceedings Zool. Soc. London, 



1899, p. 470. 

 Lernanthropus carangis Goggio, Atti Soc. Toscana Sci. Nat. Pisa, vol. 22, 



1906, p. 138. 



Remarks. — This species was referred by its author to the present 

 genus, and was so accepted by the two investigators named above. 

 There are, however, several serious differences which must be adjusted 

 before the species can be definitely located. The head is described and 

 figured as distinctly separated from the thorax ; the segments of the 

 thorax are fused and carry at their anterior end three pairs of bira- 

 mose legs, each consisting of a basal joint which covers half the width 

 of the thorax, and two tiny one- jointed rami, armed with six or seven 

 small spines. The posterior portion of the dorsal plate is split down 

 the center for its entire length and the lateral margin of each half at 

 its anterior end curves around the side of the bod}'^ and is continuous 

 with the lateral margin of a ventral plate which extends beyond the 

 tips of the anal laminae. The fourth thorax segment is three times 

 as thick dorsoventrally as the fifth, and is crescent-shaped in side 

 view, with the points turned backward. Such a creature manifestly 

 can not belong to the genus Lermanthropus^ nor indeed to any of the 

 other accepted genera, and yet its antennae and mouth parts, the first 

 two and the fourth pair of legs, and the color are just like those of the 

 present genus. 



In view of these discrepancies and because no two of Hesse's fig- 

 ures agree in their details or correspond with his text, and further 

 because only a single specimen has ever been found we are compelled 

 to reject the species from the present genus, but are unable to locate 

 it anywhere else. 



LERNANTHROPUS SCRIBAE Kr^yer. 



Lernanthropus scribae Kr0yer, Naturhistorisk Tidsskrift, ser. 3, vol. 2, 



1863, p. 203, pi. 9, fig. 3 a-g. 

 Lernanthropus scribae HEiDiai, Arbeiten Zool. Inst. Wien, vol. 2, 1879, 



p. 354. 



Remarks. — It was suggested by Heider and has been repeated by 

 other authors that this species described by Kr0yer and the one des- 



