»iii2 I'Ac.i: sKoc.sni.iic. 



tlu' typo (lescriluHl above.) Tlio part nl" tlic solvago that runs inside the rostrum lias usuallv 

 no spiue-liko proecssos. Tlic sclvajjo is linrl\- cross-striatctl alon^ a greater or less pait ol its 

 !eii>;tli. but tills eross-striation is often only perceptible with (.lillieulty. 'i'he following eoni|)oun(l 

 glands are found in this genus: Two unsymmetrieal glands as usual. Of those the left one 

 usually has its exit just in front nl the iMislero-doi-sal coiiut of the slu'll, the right one at the 

 jM>stero-vontral eorner of the shell or. when this is absent, at about tlie transition between the 

 ventral and jiosterior margins of the shell {= ,,an gewohnlicher Stelle", according to (!. W. 

 MCl.l.KU's terminologv). Son~.etimes one or both of the.se glands are more or less displaced; 

 they never emerge, however, quite symmetrically. Lateral corner glands are sometimes devel- 

 oped, sometimes they are quite absent; in the former case it happens exceptionally that only 

 that on one valve is developed. The dorso-medial glands are almost always developed in 

 the males and in exceptional cases in the females too. (Only the exceptions are mentioned in the 

 following description of species.) Inside the rostral incisur, according to G. W. MULLEii, 1894, 

 the joined part of the two lamellae of the shell is more or less deep (see loc. cit. pi. 36, 

 fig. 6, pi. 37, figs, lu and 11); the boundary of this joined part is exceedingly difficult 

 to establish with certainty; the part seems to me to be often rather narrow; cf. the description 

 of C. obtusala below. The outer lamella is not specially thin. 



First antenna: — This always shows decided diiii()r])liisni. 



Male: — This is moderately long and rather powerful, growing gradually narrower 

 distally. The two proximal joints, when in a position of rest, always point more or less -straight 

 forward, the two distal joints point in most cases rather decidedly ventrally. It has five joints, 

 but the boundary between the second and third joints is rather often more or less difficult to 

 est-abUsh with certainty (sometimes, e. g. C. curta, quite impossible). (It is to be noted that 

 I am here counting as a special joint the little collar-like part proximally of the next to the 

 distal joint; G. W. Mt'LLER, who counts this part as a part of the second joint, consecpiently 

 gives four as the number of joints in this limb; cf. p. 576 above.) The proportions between 

 the joints seem to be subject only to rather slight variation in this genus. The two proximal 

 joints are comparatively long and powerful, in most cases subequal, the three distal joints are 

 always very short and rather weak; they are of about the same type as is shown in the accom- 

 panying fig. 7 of C. symmetrica. (If nothing special is said in the following descriptions, the 

 species in question has about the same proportions between the joints as in the figure just 

 mentioned.) The first joint has in most cases* no verruciform process ventero-distally as in 

 the case of this joint in (all?) the males of the genus Euconchoecia. The second joint has dorsally, 

 at or just behind a point half way along it, a rather short and powerful bristle (retinaculum), 

 with short, fine hairs or in most cases quite bare, which fastens like a claw (,,ringf6rmig") round 

 the rod-shaped organ and fixes it to this limb. (This joining is often so firm that the rod-shaped 

 organ cannot be detached without this bristle being broken off from the antenna.) The next 

 distal joint has two**, the end joint three bristles varying in length; apart from these this limb 



• See C. dorsotuberculata, G. W. MCller. 1906 a, pi. X, fig. 9. 

 ** In pi. I, lig. 7 (Conehoecia serrulata) C. Claus. 1874 b tliis joint has, it is triR', lliiof bristles, luil this is 

 certainly due to a mistake. 



