13 



skilte, tilspidsede Plader, der delvis dækker Anal- 

 aabningen nedentil (se Tab. III, Fig. 12). 



Øinene (Tab. II, Fig. 1 og 7, 0, Fig. 3 og 4), der 

 er fæstede temmelig nær sammen ved den forreste 

 Ende af Hovedet, lige under Pandepladens Basis, 

 er vel iidviklede og omtrent af Pandepladens halve 

 Længde. De er tydeligt stilkede og meget frit be- 

 vægelige, saa at de snart kan rettes ud til hver 

 Side, snart lægges tæt ind mod hinanden og boies 

 nedad, i hvilket Tilfælde de ganske skjules mellem 

 den forreste Del af Rygskjoldets Valvler. Af Form 

 er de noget sammentrykte, aflangt ovale, eller næ- 

 sten halvmaanedaunede, med den ydre Del noget 

 udvidet og skjævt afrundet, endende nedentil i et 

 vinkelformigt Hjorne. Forkanten af Øiet er ganske 

 glat, uden Spor af de stærke Sagtakker, som findes 

 her hos Sl. ParanehaUa. Øiepigmentet, der hos det 

 levende Dyr er af en vakker purpurrød Farve, fyl- 

 der næsten ganske den ydre Halvpart af Øiet, og 

 fra det iidstraaler til alle Kanter talrige Synsele- 

 menter, i Form af smaa stærkt lysbi'vdende Legemer 

 (Krystalkegler) af kort pæredannet Form. Derimod 

 mangler den Øiet omgivende Hud (Cornea) ganske 

 ethvert Spor af nogen egentlig Facettering som hos 

 de høiere Crustaceer. Hvert Oie dækkes ved Roden 

 af en fra Pandedelen udspringende skjælformig, i en 

 skarp Spids udgaaende Plade, der næsten rækker til 

 iVIidten af Øiets Længde (se Fig. .3, 4). 



De øvre Folere (Tab. II, Fig. 1, a', Fig. .5), der 

 iidspringer lige under Øinene, er af kraftig, næsten 

 fodformig Bygning og, lige udstrakte, omtrent af 

 af Forkroppens Længde. Man kan paa dem adskille 

 et tykkere, dobbelt vinkelboiet Skaft og 2 terminale 

 Vedhæng af ulige Form, hvoraf det ene har Ud- 

 seendet af en skjælformig Plade, det andet af en 

 forlænget, mangeleddet Svobe. Skaftet bestaar af 

 4 Segmenter, hvoraf de 2 yderste er fast forbundne 

 med hinanden, medens det foregaaende (2det) Led 

 har en meget bevægelig Articulation saavel med 

 Iste som 3die Led. Iste Led af Skaftet er, som det 

 synes meget fast forbundet med Hovedet og kun 

 lidet bevægeligt, hvorfor det ved Dissection vanske- 

 ligt kan erholdes i Forbindelse med den ovrige Del. 

 Det er (se Fig. 1, Fig. 7 a') af oval Form, uden en- 

 hver Borstevæbning og opf3ddt med stærke Muskel- 



serrated, as in the posterior segments of the former. 

 The caudal rami are articulated to the extremity of 

 the last segment; they appear to correspond to the 

 so-called furca of the Copepods, and may, therefore, 

 be most properly considered to be a bifurcated 

 terminal segment. Below the ba.ge of the caudal 

 rami the last segment projects into 2, by a narrow 

 median incision, separated acuminate lamellæ which 

 partly cover the anal aperture beneath (see PI. Ill 

 fig. 12). 



The eyes (PL II, fig. 1 and 7, 0, figs. 3 and 4), 

 which are secured pretty closely together at the 

 foremost extremity of the head, just below the base 

 of the frontal plate, are well developed and about 

 half the length of the frontal plate. They are 

 distinctly stalked and very freely mobile, so that 

 they may be directed, now to each side now laid 

 close in to each other and bent downwards, in 

 which case they become quite concealed between 

 the foremost part of the valves cf the carapace. 

 In form they are somewhat compressed, oblongo- 

 oval, or almost semi-lunar, with the oiiter part 

 somewhat expanded and obliquely rounded, ter- 

 minating below in an angular corner. The anterior 

 edge of the eye is perfectly smooth without 

 trace of the powerful sawteeth found in the gen. 

 Paraiiehalia. The ocular pigment, which, in the liv- 

 ing animal, has a beautiful purple-red colour, occu- 

 pies almost completely the outer half of the eye, 

 and from it radiate numerous visual elements in 

 all directions, in the form of small, .strongly re- 

 fractive bodies (crj'stal cones) of short pyriform 

 shape. On the other hand the enclosing integument 

 (cornea) of the eye is quite deficient in every trace 

 of any real facets such as exist in the higher Cru- 

 staceans. Each eye is covered at the base by a 

 squamiform plate that issues from the frontal part, 

 and terminates in a sharp point which reaches 

 nearly to the middle of the length of the eye (see 

 figs. 3, 4). 



The superior antennæ, (Pl. II, fig. 1 a', fig. 5), which 

 issue just under the ej^es, are of powerful, almost 

 pediform structure, and when straightly extended 

 are about same length as the anterior division of 

 the body. "We can in them distinguish a thickish 

 doubly geniculated peduncle and 2 terminal appen- 

 dages of dissimilar form, of which the one has the 

 appearance of a S([uamiform plate, the other of a pro. 

 longed multi-articulate flagellum. The peduncle con- 

 sists of 4 segments, of which the two outermost 

 ones are firmly attached to each other, while the 

 preceding joint (2nd) has a very flexible articulation 

 both with the 1st and 3rd joints. The 1st joint of 

 the peduncle is, apparently, very firmly connected to 

 the head and but little flexible, hence it can with 

 difficulty be obtained on dissection, in union with 

 the remaining part. It is oval in form (see fig. 1, 



