59 



Gen. 9. Botachus, Thorell, 1859. 



Generic Characters. Body of female narrow, sub-cylindrical in shape, 

 with the matrical part remarkably elongate and the incubatory pouch only 

 slightly prominent. Tail short, deflexed, and composed of 4 segments, the 

 last of which is very short and conspicuously produced ventrally. Caudal 

 rami short, lamelliform, and armed at the end with strong claw-like spines. 

 Anterior antennae comparatively slender, attenuated, and rather densely clothed 

 with setae. Posterior antennae with a well developed plumose seta outside the 

 basal part, apical claw rather strong. Mandibular palp with the inner ramus 

 undivided, outer one narrow, sabre-like. Endopodal part of maxillae with a well 

 defined terminal joint. Anterior maxillipeds with the terminal part well developed, 

 3-articulate. Posterior maxillipeds small, uniarticulate. The 4 anterior pairs 

 of legs comparatively slender, but not adapted for swimming, both rami 3- 

 articulate, the outer one armed at the tip and outside with very slender spines, 

 setae on both rami much reduced in number. Last pair of legs very small and 

 rudimentary, resembling somewhat in structure those in the Notodelphyidce. 



Remarks. This is also a very distinct genus, though somewhat less 

 anomalous than Gunenterophonis, and more agreeing with the usual Doropygian 

 type. In addition to the typical form described below, another nearly allied 

 species has been recorded by Buchholtz from the Mediterranean under the 

 name of B. fnsiformis. 



19. Botachus cylindratus, Thorell. 

 Botachus cylindratus, Thorell, 1. c. p. 55, PI. IX, 12. 



Specific Characters. Female. Body extremely slender and narrow, with 

 the anterior division very little dilated and somewhat tapered anteriorly. Head 

 gradually contracted in front and terminating in a nearly horizontal, obtusely 

 rounded rostral plate. 1st trunkal segment very small and partly concealed by 

 the rounded lateral corner of the head. The 2 succeeding segments well 

 defined and slightly increasing in size behind. Matrical part of body, composed 

 of the last 2 coalesced trunkal segments, almost occupying half the length of 

 the body, and of oblong form, with the dorsal face only slightly vaulted and 

 encompassing the comparatively narrow incubatory cavity. Tail very short, 

 scarcely attaining in length Vn of the anterior division, and more or less 

 abruptly bent downwards; last segment very small, but produced below to a 

 rather prominent bifurcate lappet. Caudal rami forming 2 verticaljy placed 



