Vol. 3] Esterly. — Copepod Fauna. 65 



lirecht, although he formed the genus Lophothrix (Giesbrecht, 

 '95) to receive a certain form which later (Giesbrecht, '98) he 

 returned to Scolecithrix. In his opinion the genera Amallophora 

 Scott, Scapliocalanus Sars, and Lopliothrix Giesbrecht belong to 

 Scolecithrix Brady. Sars ( :02b, pp. 50, 54, 57) recognizes the 

 genera Amallophora and ScolecithriceUa in Scolecithrix, and 

 forms a new family, Diaixidae, and the genus Diaixis to receive 

 Scolecithrix hibernica Scott. ScolecithriceUa Sars includes such 

 species as Scolecithrix minor Brady (Sars, :02, p. 54), in which 

 the sensory appendages of the anterior maxilliped are all vermi- 

 form, and the fifth feet are present in the female, but 1-jointed 

 and lamellar. Sars ( :02b, p. 51) also considers his genus Scaplio- 

 calanus (Sars, :00, p. 35) to be identical with Amallophora 

 magna Scott, which, according to Giesbrecht ('98, p. 45), is prob- 

 ably the same as Scolecithrix cristata Giesbrecht. Sars ( :02b, 

 p. 55) is also of this opinion. Wolfenden ( :04, p. 120) also 

 favors the division of the sub-family Scolecithricinae (genus 

 Scolecithrix f) into the genera Scolecithrix, Amallophora, and 

 Lophothrix. Giesbrecht ( :02, p. 26, foot-note) states that in his 

 opinion the large number of species in Scolecithrix can not be 

 separated into well-defined genera, and, from what I know of the 

 group, this is my belief also. Accordingly I shall, for the present 

 at any rate, treat all the members of Scolecithrix as belonging to 

 the same genus. It may be M^ell to state that Giesbrecht ( :02, 

 p. 26) recognizes the new genus Racovitzanus in the sub-family 

 on the basis of the unpaired rostrum and the presence of a rudi- 

 mentary inner ramus on the fifth pair of feet in the female. 



Scolecithrix frontalis Giesbrecht. 



PI. 9, fig. 14; pi. 13, fig. 70. 



Lophoiluix frontalis, Giesbrecht ('95), p. 254, pi. 3, figs. 1-3. 

 Scolecithrix frontalis, Giesbrecht ('98), p. 49, fig. 10. 



Female: Forehead lengthened, with a low crest (PL 9, fig. 

 14) ; last thoracic segments fused. The second and third seg- 

 ments of the abdomen are broader than long, the third slightly 

 shorter than the first. Anterior antennae 24-jointed, reaching 

 about to the end of the body ; rami of posterior antennae abcmt 



