r»(i*J l\(ii: sK(M;si;l';i{(i 



'•'/.• rfiVnurrrr ../ \^ ,.s .sciMl aluivc (|». l.");")). tin' 1 1 .1 1 c i c y p r i il s WiTc illl lodiicrd iiit.i the lilcniluiv 



liy ,1. I). Dana. In his iniiimnu'nt;il >\.irk nl IS")2 tins in\rsi luatur ^avc a rallni- 1 liipriiui;li and 



ihr dfivlopnifnt of jj^ ^,1^, n-siu'i'ts meritorious doscriiil mii dl tln' yrnnal iiiholotiv of tliis yinun. Tlu' nior- 



viir X»i<HrW.5r of ihr . . '. . 



difffrf III organs. l>llolo<i;ic'iil valut' ot tlu' (li'st aiul sccniid aiitcniiac and id llic iiiandihlc and the liina was thus 

 cnrrt'ctly fonct'i\<'d. and tlicso organs wnr drscidud mi a lairl\ satislaclniN' manner. A de- 

 .sen])tion itiat was nn llie wlmle correet was also <iiven u[ the rod-sliaiied (irjian, ..the e.xsertih' 

 spii'uluin""; nn tiie other hand uotliinii was stated as to the nature ol this or^an. liut this writer 

 made more or less serious mistakes in the explanation and description ol the })osterior limbs. 

 It is true that the maxilla was explained correetly, ,,tlio first pair ol maxillae", but its de- 

 scription is rather detieient. Tliis aulliDr den()tod the endite tm the procoxale ol the nia.xina 

 + tiie epipodial appendaue ol' tlir lilth lindi | the seventh liml) as the ,, second pair of 

 maxillae"'; the sixth lind) was taken as the „Hrst pair of feet" and the filth limb without the 

 epipodial appendage as ..the second pair of feet". Tfie description of these organs is also rather 

 tleticient. An additional mistake was committed by this w'riter; he thought that he had fouml 

 in one species ..two simple eyes near the medial line, just jxjsterior to the base of the tentacles". 

 C. (). Saus's work of 1865 indicates a great advance, though unfortunately it is not 

 illustrated. It may be said that the general morphology of the genus Conchoecia became fairly 

 well known from this work. .\ll the limbs were correctly explained and were ciescribed in a way 

 that was on the w hole very satisfactory; the sexual dimorphism of the first and second antennae 

 and the sixth limb w-as pointed out; the upper lip and the male copulatory organ were de- 

 scribed, though only in very general terms; the absence of eyes was established (for the occur- 

 rence of these organs in the first antenna see p. 560 above). This writer even perhaps observed 

 the heart, but he only speaks indistinctly on this point (it is not (piitc clear if he means that 

 the whole group Mi/odocopa is characterized by this organ or if it is only found in a number 

 of representatives of this group; cf. p. (>).* 



After this work our knowledge of the morphology of the H alocypr ids has been 

 increased still further. The most important works are the following: C. Claus, 1874 b and 

 1891a. (i. (). Sahs, 1887 and (i. \V. Mri].i:n. 189(1 a and 1894. The most important of these 

 works is perhaps the last-mentioned of ('. ('l..\l s's, which is eipiaily distinguished by its com- 

 prehensiveness as by its wealth of detail; this work made the H a 1 o c y j) r i d s the best 

 known group among the marine s t r a c o d s and one of the best known among all Crusfacea. 

 0. \V. MCLLER's Naples monograph is the last work in which the morphology of the Hal o- 

 c v p r i d s is dealt with in detail. 

 The deiriopment of j^^ .^ preliminary work (1849) J. I). I)A\A collected all the species of this group invest- 



'hp classification of . . , , . 



7ie Halocyprids. igated by him into a single genus, Conchoecia, and in 1852 he divided them into two genera, 

 Conchoecia and Halocyprts. From these genera this writer formed the sub-family Halocyprinae, 

 which was grouped together with the sub-family Ci/pridininae to form the family H alocypr idae; 

 cf. p. 155 above. — The descriptions of the genera Conchoecia and Halocypris were, however, 

 exceedingly incomplete and partly incorrect as well. One result of this was that the succeeding 

 authors formed a more or less completely erroneous idea of these genera; they were quite confused 



* Otherwise C. Glaus, I87i b, p. 5, was the first to ohsevvc this organ. 



