The annals and magazine of natural history : zoology, botany, and geology . towards the side that is ventral when thechela is extended. This tooth apparently corresponds to one * Jenaische Zeitschr. xxxiii. 1898, p. -!?. t Bull. Bureau fisheries, Washington, xxix. 1009, p. 260 232 On a new Species of Thaumastocheles. which, in Th. zaleucus, seems to be in series with the ven-trally directed row, though it is larger than its neighboursand a little more inclined than they are. The specimens described by Doflein and Miss Rathbun areidentified with the species here described not only on accountof
The annals and magazine of natural history : zoology, botany, and geology . towards the side that is ventral when thechela is extended. This tooth apparently corresponds to one * Jenaische Zeitschr. xxxiii. 1898, p. -!?. t Bull. Bureau fisheries, Washington, xxix. 1009, p. 260 232 On a new Species of Thaumastocheles. which, in Th. zaleucus, seems to be in series with the ven-trally directed row, though it is larger than its neighboursand a little more inclined than they are. The specimens described by Doflein and Miss Rathbun areidentified with the species here described not only on accountof the locality whence they were obtained, but also becausethe figures given by these authors show the teeth of thelarger chela arranged as in the St. Andrews specimen. It isto be noted, however, that Dofleins figure shows the palm ofthe smaller cheliped to be more than half the length of thefingers. If this be correct, the character in question shouldbe omitted from the specific diagnosis, or qualified by thewords in the female. In Dofleins figure, also, the smaller Diagram (not drawn to scale) showing1 arrangement of teeth on finger oflarge cheliped : I. Thaumastocheles zaleucus ; II. Th. japonicus. chela is nearly straight, as it is in the type of Th. zaleucus,while in the St. Andrews specimen of Th. japonicus, as in thephotograph given by Miss Rathbun, the immovable finger isbent outwards so as to form an obtuse angle with the both species the last pair of perseopods are minutely butperfectly chelate. This character is apparently not confinedto the female sex, as Spence Bate suspected it might be,since Doflein states that in the male specimen examined byhim Die Pereiopoden sincl vollkommen wie nach derBeschreibung von Bate beim ? . In the female of both species there is, on the sternal surfaceof the thorax, between the bases of the penultimate pair oflegs, a trilobed structure which, from the analogy of the On new Species of Mollusca. 233 common lobster, is probab
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