I 



STATE GEOLOGIST. 143 



Sp. 1. Liiimocalaniis niacriiriis, Sais. 



A species similar to L. macrurus has been found in lake Michigan, 

 and probably occurs also in this state in lake Superior. We can 

 do no better than quote Bars'* description. 



"Corpus gracile et angustatiim. Cephalothorax supra visus elongate ovatus, latitu- 

 dine maxima in medio sita antics et postice aequaliter atteauatus. Caput anuulum 

 unicum praebens, a latere visum parte antica altiore et convexa sinu distincto a poster- 

 iore disjuncta, margine antico oblique descendente. Segmentum ultimum thoracis par- 

 vum neque ad latera extans in femina et mare simile. Abdomen sub-cylindricum tbor- 

 ace longius. Eami caudales valde elongatl et angustati tertium longitudinis abdominis 

 partem superantes, supra Pt ad latera spinulis vel pllis brevibus obsiti, intus ciliati, 

 setis 5 majoribus uniarticulatis et ciliatis, quarum 2-da ab interiore numerata omnium 

 longissima ceteraeque extus graduatim longitundine decrescentes, exteriore ceteris 

 minore absque apice sat remota ; seta adest praeterea alia intus adfixa ut in generibus 

 antecedentibus tenuissima et simplex. Frons a latere visa obtuse acuminata appendic- 

 ibus tentaculiformibus duabus perbrevibus instructa. Antennas l-mi paris reflexae seg- 

 mentum peuuliimum abdominis minime attingentes, articulo ultimo setis 5, quarum 

 posteriores 2 longissimae, instructo, articulis antecedentibus 3 setae simili postice ver- 

 gente praeditis ; dextra maris articulatione inter articulum 18-mum et 19-mum geniculans. 

 Autennarum 2-di paris ramus exterior interiore et longior et latior, 7-articulatus, arti- 

 culo 2-do omnium maximo. sequentibus 4 minimis junctis articulo ultimo brevioribus 

 setisque longissimis instructis. Mandibulaead extreraitatem inferiorem in dentes ex- 

 euntes 9, quorum exteriores 2 ceteris majores, interiores 2 tenues et setiferes sunt ; pal- 

 pus longus et angustatus 3-articulatus, articulis ultimis 2 brevissimis, ramo exteriore, 

 vel anpendice branchiale, parvo. Maxillae 1-mi paris eadem fere structura ac in Diap- 

 tomo. Maxillae 2-di paris validissimae 8-arliculatae, articulis ultimis 5 in ungues exeun- 

 tibus longissimos et fortissimos margine altero sparsim piloses, ad apicem falcatum 

 vero nudos vel aculeis persubtile et dense obsitos ; 3-tii paris [Maxillipedes] valde elon- 

 gatte et angustatae antice vergentes articulis 7 setis pleurumque longis praeditis compo- 

 site. Pedes omnes biramosi natatorii, ultimo pari in mare bi-articuiatus in pede dex- 

 tro et sinistro dissimilis, articulo ultimo in illo brevi et robusto ad apicem quasi trun- 

 cate dentibnsque 3 parvis et obtusis armato intus vero in aculeum niagoum et validum 

 exeurrente, in hoc valde elongate extus et ad apicem aculeate intus vero nude. Oculus 

 unicus prepius marginem inferiorem capitis situs. Animal quamquam pellucidissimus 

 et fere omnino hyalinum, facile tamen accumulatione in thorace sat magna liquoris 

 oleosi Ijete fulvo-rubide ceiorati se prodit, Longir. circit. 2V2 mm." 



FAMILY CYCLOPID.E. 



Contains five genera, viz: Thorellia^ Cyclojos^ Olthona, LopJio- 

 pliorus and Cyclojnna; passing, by the geneva Misophria and Pseii- 

 do-cijclops, into the Calanidce or marine copepods. The affinities of 

 these little known genera need further study, as they are very in- 

 teresting, the question being still open in how far the cyclopoid 

 forms are altered by adaptation to saline habitat, if such an adapta- 

 tion takes place at all. 



Cephaiothorax ovate and usually much more robust than the 

 abdomen; anterior antennae seldom longer than the cephaiothorax, 

 those of the male alike on both sides and modified for the purpose 

 of clasping; posterior antennae unbranched (i. e. palpus wanting); 



