.-584 'rAOK SKOGSI'.EHG 



bristles: The row of bristles on the rostrum has rather numerous bristles (about the same as 

 shown in fig. 2 of Ph. (Ph.) Lilljeborgi). On the posterior part of the list there is a moderate 

 number of bristles, partly arranged in groups. Between the list and the posterior margin of 

 the shell there is a rather small number of short bristles (about the same as shown in fig. 3 of 

 Ph. (Ph.) Lilljeborgi). The marginal hairs on the rostral selvage are rather long. The long 

 secondary bristles on the selvage behind the incisur, issuing from inside the margin of the selvage, 

 are very few in number; they sometimes seem to be entirely absent. Between the list and the 

 posterior margin of the shell there is no pocket-like formation as in Pli. (Ph.) Lilljeborgi. Colour: 

 According to C. Apstein, 1911, it is a beautiful red; the preserved specimens are a whitish yellow. 

 First antenna: — Of the three bristles on the second joint the anterior one is 

 about as long as the anterior side of the third joint or the tliird plus the fourth joints, the posterior 

 one about as long as the total length of the third and fourth or the third to the fifth joints, the 

 lateral one is in most cases slightly shorter than the posterior one. The third joint has most 

 frequently two anterior bristles and one posterior bristle distally. Of the two anterior ones the 

 posterior one is often about as long as the total length of the third and fourth joints, the other 

 is only about half this length. The posterior one is, in most cases, about as long as the fourth 

 joint. In some cases three anterior distal bristles are found on this joint, either on both antennae 

 or only on one. The fourth joint has one anterior bristle, which is about twice the length of 

 the fifth joint, and four posterior bristles. Of the latter the two lateral ones are about as long 

 as the posterior side of the second to the fourth joints, the one nearest to them is about as long 

 as or a little longer than the anterior bristle on this joint, the remaining one, the inner one, is 

 only about half as long. The bristle of the fifth joint is about as long as the last-mentioned 

 bristle. The a-bristle on the end joint is about as long as the anterior bristle of the fourth joint. 

 Either all these bristles are equipped at the middle with one or a few irregular wreaths of long, 

 stiff secondary bristles or else some of them may be without such wreaths; the following bristles 

 were sometimes found to have no wreaths of bristles: the shorter of the two anterior bristles 

 on the third joint and one of the long ones of the four posterior bristles on the fourth joint; the 

 wreaths on these bristles vary both fi-om one individual to another and on the right and left 

 antennae of the same individual. As is seen from what has been said above, the length of these 

 bristles varies somewhat; the variation is, however, rather slight. End joint: The b-bristle has 

 one sensorial filament somewhat proximally of half its length and three distal sensorial filaments; 

 in one case two proximal sensorial filaments were found on this bristle on the first antenna of 

 one side, the other first antenna had only one, as usual. The two c-bristles have in most cases 

 five proximal and four distal sensorial filaments: in one case (on both the first antennae) five 

 proximal sensorial filaments were found on one of these bristles and six on the other; in another 

 specimen (similarly on both the first antennae) six proximal sensorial filaments were foimd 

 on both these bristles; finally in a third case five proximal sensorial filaments were discovered 

 on one of these bristles on both first antennae, on the other six on one antenna, seven on the 

 other. The f-bristle has four proximal and foiu' distal sensorial filaments; only in one ease were 

 six proximal sensorial filaments found on this bristle on the first antenna of one side. The 

 g-bristle always has tliree proximal and four distal sensorial filaments. The position of these 



