Mi) \\r.\-: sK()(iSiii;i;(; 



S !• V (• II t li 1 i 111 1>: — This sliows MO (liiiit>r|(liisiii and varies very sliglilly in t his <;rnii|). 

 It sooins to sorvt' cliit'llv as a sort of ch'imiiig orpui, Iml its cITcctivfuess does not sociii to l)c 

 vt-rv irn'iit; cf. (i. W . Mi'M.i:!;, lS!t4, y. I'.V; it is |ir(ilial>l\ to lie taken as a very iiiuch rcdmcd 

 or<'aii. Like the rleaniiij; limb in tlio Cijprulinijonues it is phici'd fairly hi^h iip on I he si(h' 

 of the boilv. soiiunvliat behind the sixtli liinh. \\'h('n in a |iosition of rest it points in niostr cases 

 obli(|uelv upwards and backwards. It is very small and consists of ciiiite a short, two-jointed 

 or unjointed stem, which firows somewhat narrower distally and is furnished with siin])le, 

 moderately strong musculature. (Tlie i|uestion of tlie morphological v.due ol this stem seems 

 at pre.sent impossible to decide with certainty; docs it correspond to tlie |)roto])oditc + the 

 exopodite or only to the exopodite? See p. 50 above. The latter alternative seems most prob- 

 able to me.) The e p i p o d i a 1 appendage and the e n d o p o d i t e are (piite absent. 

 The proximal joint, which is somewhat elongated, is quite without bristles. The end joint is 

 short and has two well-developed distal* bristles. 



The brush-shaped organ is c^uite absent. 



F II r ea: — This is always well developed, rather large and powerful with short, broad 

 lamelliform rami, armed with a varying number of claws: from two to eight were observed. 

 The heart is always developed? 



Sensory organs — Quite blind forms** ; no traces of cither lateral eyes or a Nauplius eye, 

 have hitherto been found. (G. 0. Saks pointed out in his work of 1865, pp. 116—117, the following 

 facts: ..In basi vero antennaruni superiorum corpuscula adsunt pluria lentiforraia, irregulariter 

 acervatis sed semper in stratu distincte nervoso coUocata pigmento vero nullo circumdata, 

 quae organa quamquam imperfecta visus esse videntur." In this writer's work of 1887, p. 70, 

 too, the occurrence of similar bodies is pointed out „en Del eiendommelige lindseagtige Legemer, 

 der maaske tor ansees for et Slags ufuldkomne Synsapparater"*** in the proximal part of the 

 first antenna in a couple of the Scandinavian species of the genus Conchoecia. This observation 

 is repeated by 6. S. Brady and A. M. Norman, 1896, p. 685; they point out that the first joint 

 of the first antenna in Conchoecia degans G. 0. SaRS „shows, irregularly scattered near its surface, 

 a number of lenticular bodies overlaying patches of red pigment, perhaps rudimentary visual 

 organs". I have found similar patches in the first antennae not only of C. elegans and C. borealis, 

 the species referred to by G. 0. Sars, but of a great number of species of this genus; in exceptional 

 cases these are also found in other places, e. g. on the protopodite of the second antenna in, for 

 instance, C. hettacra G. W. MUller. It seems very uncertain whether these bodies are visual 

 organs but it seems best not to make any statement as to their morphological value before 

 any experiments at all have been carried out. In any case such statements could only be very 

 uncertain. ) 



A rod-shaped organf is developed in most cases. 



* Only in exceptional cases, in single specimens, are three bristles foniiil. 

 ** For J. D. Data's establishing of eyes (1852, p. 1297) see j). 562 below. 

 ••* ..Some peculiar lenticular bodies, which are perhaps to be interpreted as a sort of imperfect visual organs." 

 t G. W.Mi-LLER proposes (1894, p. 163) as the „wahrscheinlichste, oder, wenn man will, am wcnigsten 

 u.uvdhrscheinliche" explanation of the rod-shaped organ in the H a 1 o c y p r i d s that it is a light-percipient organ, 

 not, however, for forming images, but only for ,,eine Unterschcidung von hrll und dunkel". 



