Jennings. — Pedunculate Cirripedia of New Zealand. 



289 



(2) two well-developed filaments on each side of the body. The carina is 

 not barbed, and square patches on the capitulum are not visible. In 

 size and remaining characters it is indistinguishable from the general 

 type. 



The numerous specimens of this variety, collected as mentioned in the 

 first part of this paper, all agree distinctly with L. anatifera Linn., general 

 type, of which excellent specimens were also obtained from the Marine 

 Biological Laboratory, Plymouth, England, for purposes of comparison, 

 with this uniformly exceptional character : that there is no trace of an 

 umbonal tooth on either scutum. The umbonal angles may be slightly 

 incurved, their apices may sometimes slightly overlap, but there is no 

 more definite tooth than in L. hillii, and nothing approaching the distinct 

 tooth of the genera] type of L. anatifera nor the distinct teeth of L. australis. 



Possible confusion of L. australis and L. anatifera : The wide forking 

 of the carina below the basal margin of the scuta, and the umbonal tooth, 

 on each scutum, would ordinarily allow one 

 to recognize L. australis from this new 

 variety. Bui I have specimens among 

 others undoubtedly L. australis in which 

 the prongs of the carinal fork are scarce!}' 

 developed, and no more than an incurving 

 occurs at the umbo of either scutum. I 

 have decided that these are immature speci- 

 mens of L. australis : the carina] fork is 

 undeveloped and the penis does not project 

 through the cirri. They were collected alive 

 in midsummer, were apparently full size, and 

 contained ova. I have specimens from the 

 same lot showing in gradation just one 

 small tooth on the right scutum, and then ,; 

 the two small teeth accompanied by a wider 

 forking of the carina and lengthening of the 

 penis. I think the view of immaturity is FlG# 2 ._ Lepas anatifera Linnaeus 



general type. Marine Bio- 

 logical Laboratory, Plymouth. 

 Opercular valves. 1, Right 

 scutum ; 2, left scutum ; 3, 

 umbonal tooth. Length of 

 capitulum, 34 mm. 



therefore a correct one. All have the two 

 distinct filaments on each side of the body. 



One can easily see that a slightly im- 

 mature specimen of L. australis could be 

 selected which the specific characters as at 

 present given in the standard works quoted 

 would fail to distinguish from L. anatifera general type or L. anatifera 

 var. (c) new var. Only a collector familiar with general appearances 

 rould distinguish them, and he would have a difficulty in basing his dis- 

 tinction on constant characters. He would have to fall back on the 

 curvature of the occludent margin, the thinness of the valves, and pos- 

 session of 3 prominent spines at the upper angle of the maxilla, which seem 

 fairly constant.* The adult L. australis is, however, apparently the certain 

 possessor of 2 distinct umbonal teeth and a specially wide carinal fork, and 

 therefore can be readily identified. The point is, can L. anatifera var. (c) 



* ( 1.) Most maxillae of L. antifera and L. hillii have 1 or 2 prominent spines at the 

 upper angle. (2.) Further, without dissection, or if the specimen were dry, it appears 

 impossible to state definitely whether certain forms are L. australis, L. hillii, or L. anatifera. 

 The dry specimens of these in the museums are, therefore, scarcely reliable. 



10— Trans. 



